diff --git a/frontend/src/__tests__/components/forms/EmailTemplateForm/EmailTemplateForm.test.tsx b/frontend/src/__tests__/components/forms/EmailTemplateForm/EmailTemplateForm.test.tsx
index 43731eab0..77fc506b2 100644
--- a/frontend/src/__tests__/components/forms/EmailTemplateForm/EmailTemplateForm.test.tsx
+++ b/frontend/src/__tests__/components/forms/EmailTemplateForm/EmailTemplateForm.test.tsx
@@ -5,6 +5,7 @@ import {
   EmailTemplate,
 } from 'nhs-notify-web-template-management-utils';
 import { EmailTemplateForm } from '@forms/EmailTemplateForm/EmailTemplateForm';
+import { ErrorCodes } from '@utils/error-codes';
 
 jest.mock('@utils/amplify-utils');
 
@@ -91,7 +92,10 @@ test('renders page with multiple errors', () => {
           fieldErrors: {
             emailTemplateName: ['Template name error'],
             emailTemplateSubjectLine: ['Template subject line error'],
-            emailTemplateMessage: ['Template message error'],
+            emailTemplateMessage: [
+              'Template message error',
+              ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+            ],
           },
         },
         name: '',
diff --git a/frontend/src/__tests__/components/forms/EmailTemplateForm/__snapshots__/EmailTemplateForm.test.tsx.snap b/frontend/src/__tests__/components/forms/EmailTemplateForm/__snapshots__/EmailTemplateForm.test.tsx.snap
index bfc6f5a11..bb41e4462 100644
--- a/frontend/src/__tests__/components/forms/EmailTemplateForm/__snapshots__/EmailTemplateForm.test.tsx.snap
+++ b/frontend/src/__tests__/components/forms/EmailTemplateForm/__snapshots__/EmailTemplateForm.test.tsx.snap
@@ -167,7 +167,6 @@ exports[`Client-side validation triggers 1`] = `
               <textarea
                 autocomplete="off"
                 class="nhsuk-textarea"
-                data-testid="emailTemplateMessage-input"
                 id="emailTemplateMessage"
                 name="emailTemplateMessage"
                 rows="12"
@@ -254,9 +253,6 @@ exports[`Client-side validation triggers 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -753,16 +749,6 @@ exports[`renders page one error 1`] = `
               Template name error
             </a>
           </li>
-          <li>
-            <a
-              href="#emailTemplateSubjectLine"
-            />
-          </li>
-          <li>
-            <a
-              href="#emailTemplateMessage"
-            />
-          </li>
         </ul>
       </div>
       <h1
@@ -917,7 +903,6 @@ exports[`renders page one error 1`] = `
               <textarea
                 autocomplete="off"
                 class="nhsuk-textarea"
-                data-testid="emailTemplateMessage-input"
                 id="emailTemplateMessage"
                 name="emailTemplateMessage"
                 rows="12"
@@ -1002,9 +987,6 @@ exports[`renders page one error 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -1515,6 +1497,61 @@ exports[`renders page with multiple errors 1`] = `
               Template message error
             </a>
           </li>
+          <li>
+            <a
+              href="#emailTemplateMessage"
+            >
+              <div
+                class="nhsuk-u-margin-top-1 nhsuk-u-margin-bottom-4"
+              >
+                You cannot use the following custom personalisation fields in your message:
+              </div>
+              <ul
+                class="nhsuk-list nhsuk-list--bullet"
+              >
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  date
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_1
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_2
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_3
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_4
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_5
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_6
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_7
+                </li>
+              </ul>
+            </a>
+          </li>
         </ul>
       </div>
       <h1
@@ -1688,12 +1725,60 @@ exports[`renders page with multiple errors 1`] = `
                   Error: 
                 </span>
                 Template message error
+                <div
+                  class="nhsuk-u-margin-top-1 nhsuk-u-margin-bottom-4"
+                >
+                  You cannot use the following custom personalisation fields in your message:
+                </div>
+                <ul
+                  class="nhsuk-list nhsuk-list--bullet"
+                >
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    date
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_1
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_2
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_3
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_4
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_5
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_6
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_7
+                  </li>
+                </ul>
               </span>
               <textarea
                 aria-describedby="emailTemplateMessage--error-message"
                 autocomplete="off"
                 class="nhsuk-textarea nhsuk-textarea--error"
-                data-testid="emailTemplateMessage-input"
                 id="emailTemplateMessage"
                 name="emailTemplateMessage"
                 rows="12"
@@ -1778,9 +1863,6 @@ exports[`renders page with multiple errors 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -2394,7 +2476,6 @@ exports[`renders page with preloaded field values 1`] = `
               <textarea
                 autocomplete="off"
                 class="nhsuk-textarea"
-                data-testid="emailTemplateMessage-input"
                 id="emailTemplateMessage"
                 name="emailTemplateMessage"
                 rows="12"
@@ -2481,9 +2562,6 @@ exports[`renders page with preloaded field values 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -3090,7 +3168,6 @@ exports[`renders page without back link for initial state with id - edit mode 1`
               <textarea
                 autocomplete="off"
                 class="nhsuk-textarea"
-                data-testid="emailTemplateMessage-input"
                 id="emailTemplateMessage"
                 name="emailTemplateMessage"
                 rows="12"
@@ -3177,9 +3254,6 @@ exports[`renders page without back link for initial state with id - edit mode 1`
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
diff --git a/frontend/src/__tests__/components/forms/EmailTemplateForm/server-action.test.ts b/frontend/src/__tests__/components/forms/EmailTemplateForm/server-action.test.ts
index 45c1e9305..844a4d501 100644
--- a/frontend/src/__tests__/components/forms/EmailTemplateForm/server-action.test.ts
+++ b/frontend/src/__tests__/components/forms/EmailTemplateForm/server-action.test.ts
@@ -4,6 +4,7 @@ import { EmailTemplate } from 'nhs-notify-web-template-management-utils';
 import { redirect } from 'next/navigation';
 import { processFormActions } from '@forms/EmailTemplateForm/server-action';
 import { MAX_EMAIL_CHARACTER_LENGTH } from '@utils/constants';
+import { ErrorCodes } from '@utils/error-codes';
 
 jest.mock('@utils/amplify-utils');
 jest.mock('@utils/form-actions');
@@ -91,6 +92,30 @@ describe('CreateEmailTemplate server actions', () => {
     });
   });
 
+  it('create-email-template - should return response when when template message contains unsupported personalisation', async () => {
+    const response = await processFormActions(
+      initialState,
+      getMockFormData({
+        'form-id': 'create-email-template',
+        emailTemplateName: 'template-name',
+        emailTemplateSubjectLine: 'template-subject-line',
+        emailTemplateMessage: 'a template message containing ((date))',
+      })
+    );
+
+    expect(response).toEqual({
+      ...initialState,
+      errorState: {
+        formErrors: [],
+        fieldErrors: {
+          emailTemplateMessage: [
+            ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+          ],
+        },
+      },
+    });
+  });
+
   test('should save the template and redirect', async () => {
     saveTemplateMock.mockResolvedValue({
       ...initialState,
diff --git a/frontend/src/__tests__/components/forms/LetterTemplateForm/__snapshots__/LetterTemplateForm.test.tsx.snap b/frontend/src/__tests__/components/forms/LetterTemplateForm/__snapshots__/LetterTemplateForm.test.tsx.snap
index 40d1fc212..a8c1d2538 100644
--- a/frontend/src/__tests__/components/forms/LetterTemplateForm/__snapshots__/LetterTemplateForm.test.tsx.snap
+++ b/frontend/src/__tests__/components/forms/LetterTemplateForm/__snapshots__/LetterTemplateForm.test.tsx.snap
@@ -960,31 +960,6 @@ exports[`renders page one error 1`] = `
                 Template name error
               </a>
             </li>
-            <li>
-              <a
-                href="#letterTemplateCampaignId"
-              />
-            </li>
-            <li>
-              <a
-                href="#letterTemplateLetterType"
-              />
-            </li>
-            <li>
-              <a
-                href="#letterTemplateLanguage"
-              />
-            </li>
-            <li>
-              <a
-                href="#letterTemplatePdf"
-              />
-            </li>
-            <li>
-              <a
-                href="#letterTemplateCsv"
-              />
-            </li>
           </ul>
         </div>
         <form
@@ -1958,21 +1933,6 @@ exports[`renders page with multiple errors 1`] = `
                 CSV error
               </a>
             </li>
-            <li>
-              <a
-                href="#letterTemplateCampaignId"
-              />
-            </li>
-            <li>
-              <a
-                href="#letterTemplateLetterType"
-              />
-            </li>
-            <li>
-              <a
-                href="#letterTemplateLanguage"
-              />
-            </li>
           </ul>
         </div>
         <form
diff --git a/frontend/src/__tests__/components/forms/NhsAppTemplateForm/NhsAppTemplateForm.test.tsx b/frontend/src/__tests__/components/forms/NhsAppTemplateForm/NhsAppTemplateForm.test.tsx
index 45756b112..99baf12f0 100644
--- a/frontend/src/__tests__/components/forms/NhsAppTemplateForm/NhsAppTemplateForm.test.tsx
+++ b/frontend/src/__tests__/components/forms/NhsAppTemplateForm/NhsAppTemplateForm.test.tsx
@@ -6,6 +6,7 @@ import {
   TemplateFormState,
 } from 'nhs-notify-web-template-management-utils';
 import { NhsAppTemplateForm } from '@forms/NhsAppTemplateForm/NhsAppTemplateForm';
+import { ErrorCodes } from '@utils/error-codes';
 
 jest.mock('@utils/amplify-utils');
 
@@ -115,7 +116,10 @@ test('renders page with multiple errors', () => {
           formErrors: [],
           fieldErrors: {
             nhsAppTemplateName: ['Template name error'],
-            nhsAppTemplateMessage: ['Template message error'],
+            nhsAppTemplateMessage: [
+              'Template message error',
+              ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+            ],
           },
         },
         name: '',
diff --git a/frontend/src/__tests__/components/forms/NhsAppTemplateForm/__snapshots__/NhsAppTemplateForm.test.tsx.snap b/frontend/src/__tests__/components/forms/NhsAppTemplateForm/__snapshots__/NhsAppTemplateForm.test.tsx.snap
index 52ee15285..a48cf6277 100644
--- a/frontend/src/__tests__/components/forms/NhsAppTemplateForm/__snapshots__/NhsAppTemplateForm.test.tsx.snap
+++ b/frontend/src/__tests__/components/forms/NhsAppTemplateForm/__snapshots__/NhsAppTemplateForm.test.tsx.snap
@@ -246,9 +246,6 @@ exports[`Client-side validation triggers 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -931,9 +928,6 @@ exports[`renders page 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -1427,11 +1421,6 @@ exports[`renders page one error 1`] = `
               Template name error
             </a>
           </li>
-          <li>
-            <a
-              href="#nhsAppTemplateMessage"
-            />
-          </li>
         </ul>
       </div>
       <h1
@@ -1656,9 +1645,6 @@ exports[`renders page one error 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -2159,6 +2145,61 @@ exports[`renders page with multiple errors 1`] = `
               Template message error
             </a>
           </li>
+          <li>
+            <a
+              href="#nhsAppTemplateMessage"
+            >
+              <div
+                class="nhsuk-u-margin-top-1 nhsuk-u-margin-bottom-4"
+              >
+                You cannot use the following custom personalisation fields in your message:
+              </div>
+              <ul
+                class="nhsuk-list nhsuk-list--bullet"
+              >
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  date
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_1
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_2
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_3
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_4
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_5
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_6
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_7
+                </li>
+              </ul>
+            </a>
+          </li>
         </ul>
       </div>
       <h1
@@ -2296,6 +2337,55 @@ exports[`renders page with multiple errors 1`] = `
                   Error: 
                 </span>
                 Template message error
+                <div
+                  class="nhsuk-u-margin-top-1 nhsuk-u-margin-bottom-4"
+                >
+                  You cannot use the following custom personalisation fields in your message:
+                </div>
+                <ul
+                  class="nhsuk-list nhsuk-list--bullet"
+                >
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    date
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_1
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_2
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_3
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_4
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_5
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_6
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_7
+                  </li>
+                </ul>
               </span>
               <textarea
                 aria-describedby="nhsAppTemplateMessage--error-message"
@@ -2395,9 +2485,6 @@ exports[`renders page with multiple errors 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -3080,9 +3167,6 @@ exports[`renders page with preloaded field values 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -3758,9 +3842,6 @@ exports[`renders page without back link for initial state with id - edit mode 1`
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
diff --git a/frontend/src/__tests__/components/forms/NhsAppTemplateForm/server-action.test.ts b/frontend/src/__tests__/components/forms/NhsAppTemplateForm/server-action.test.ts
index fe7fa05e3..587819c5c 100644
--- a/frontend/src/__tests__/components/forms/NhsAppTemplateForm/server-action.test.ts
+++ b/frontend/src/__tests__/components/forms/NhsAppTemplateForm/server-action.test.ts
@@ -6,6 +6,7 @@ import type {
 } from 'nhs-notify-web-template-management-utils';
 import { redirect } from 'next/navigation';
 import { processFormActions } from '@forms/NhsAppTemplateForm/server-action';
+import { ErrorCodes } from '@utils/error-codes';
 
 jest.mock('@utils/amplify-utils');
 jest.mock('@utils/form-actions');
@@ -94,6 +95,29 @@ describe('CreateNHSAppTemplate server actions', () => {
     });
   });
 
+  it('create-nhs-app-template - should return response when when template message contains unsupported personalisation', async () => {
+    const response = await processFormActions(
+      initialState,
+      getMockFormData({
+        'form-id': 'create-nhs-app-template',
+        nhsAppTemplateName: 'template-name',
+        nhsAppTemplateMessage: 'a template message containing ((date))',
+      })
+    );
+
+    expect(response).toEqual({
+      ...initialState,
+      errorState: {
+        formErrors: [],
+        fieldErrors: {
+          nhsAppTemplateMessage: [
+            ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+          ],
+        },
+      },
+    });
+  });
+
   it('create-nhs-app-template - should return response when when template message contains link with angle brackets', async () => {
     const response = await processFormActions(
       initialState,
diff --git a/frontend/src/__tests__/components/forms/SmsTemplateForm/SmsTemplateForm.test.tsx b/frontend/src/__tests__/components/forms/SmsTemplateForm/SmsTemplateForm.test.tsx
index 65960025c..45e187fa8 100644
--- a/frontend/src/__tests__/components/forms/SmsTemplateForm/SmsTemplateForm.test.tsx
+++ b/frontend/src/__tests__/components/forms/SmsTemplateForm/SmsTemplateForm.test.tsx
@@ -7,6 +7,7 @@ import {
   CreateUpdateSMSTemplate,
 } from 'nhs-notify-web-template-management-utils';
 import { SmsTemplateForm } from '@forms/SmsTemplateForm/SmsTemplateForm';
+import { ErrorCodes } from '@utils/error-codes';
 
 jest.mock('react', () => {
   const originalModule = jest.requireActual('react');
@@ -80,7 +81,10 @@ describe('CreateSmsTemplate component', () => {
             formErrors: [],
             fieldErrors: {
               smsTemplateName: ['Template name error'],
-              smsTemplateMessage: ['Template message error'],
+              smsTemplateMessage: [
+                'Template message error',
+                ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+              ],
             },
           },
           id: 'template-id',
diff --git a/frontend/src/__tests__/components/forms/SmsTemplateForm/__snapshots__/SmsTemplateForm.test.tsx.snap b/frontend/src/__tests__/components/forms/SmsTemplateForm/__snapshots__/SmsTemplateForm.test.tsx.snap
index a229b5cc2..80d1b2b85 100644
--- a/frontend/src/__tests__/components/forms/SmsTemplateForm/__snapshots__/SmsTemplateForm.test.tsx.snap
+++ b/frontend/src/__tests__/components/forms/SmsTemplateForm/__snapshots__/SmsTemplateForm.test.tsx.snap
@@ -290,9 +290,6 @@ exports[`CreateSmsTemplate component Client-side validation triggers 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -498,11 +495,6 @@ exports[`CreateSmsTemplate component renders page one error 1`] = `
               Template name error
             </a>
           </li>
-          <li>
-            <a
-              href="#smsTemplateMessage"
-            />
-          </li>
         </ul>
       </div>
       <h1
@@ -743,9 +735,6 @@ exports[`CreateSmsTemplate component renders page one error 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -1161,9 +1150,6 @@ exports[`CreateSmsTemplate component renders page with back link if initial stat
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -1376,6 +1362,61 @@ exports[`CreateSmsTemplate component renders page with multiple errors 1`] = `
               Template message error
             </a>
           </li>
+          <li>
+            <a
+              href="#smsTemplateMessage"
+            >
+              <div
+                class="nhsuk-u-margin-top-1 nhsuk-u-margin-bottom-4"
+              >
+                You cannot use the following custom personalisation fields in your message:
+              </div>
+              <ul
+                class="nhsuk-list nhsuk-list--bullet"
+              >
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  date
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_1
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_2
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_3
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_4
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_5
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_6
+                </li>
+                <li
+                  class="nhsuk-u-margin-bottom-0"
+                >
+                  address_line_7
+                </li>
+              </ul>
+            </a>
+          </li>
         </ul>
       </div>
       <h1
@@ -1512,6 +1553,55 @@ exports[`CreateSmsTemplate component renders page with multiple errors 1`] = `
                   Error: 
                 </span>
                 Template message error
+                <div
+                  class="nhsuk-u-margin-top-1 nhsuk-u-margin-bottom-4"
+                >
+                  You cannot use the following custom personalisation fields in your message:
+                </div>
+                <ul
+                  class="nhsuk-list nhsuk-list--bullet"
+                >
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    date
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_1
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_2
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_3
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_4
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_5
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_6
+                  </li>
+                  <li
+                    class="nhsuk-u-margin-bottom-0"
+                  >
+                    address_line_7
+                  </li>
+                </ul>
               </span>
               <textarea
                 aria-describedby="smsTemplateMessage--error-message"
@@ -1628,9 +1718,6 @@ exports[`CreateSmsTemplate component renders page with multiple errors 1`] = `
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
@@ -2039,9 +2126,6 @@ exports[`CreateSmsTemplate component renders page with no back link if initial s
               <li>
                 ((nhsNumber))
               </li>
-              <li>
-                ((date))
-              </li>
             </ul>
             <p>
               Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
diff --git a/frontend/src/__tests__/components/forms/SmsTemplateForm/server-action.test.ts b/frontend/src/__tests__/components/forms/SmsTemplateForm/server-action.test.ts
index 97a0722b7..4a6a1decf 100644
--- a/frontend/src/__tests__/components/forms/SmsTemplateForm/server-action.test.ts
+++ b/frontend/src/__tests__/components/forms/SmsTemplateForm/server-action.test.ts
@@ -4,6 +4,7 @@ import { SMSTemplate } from 'nhs-notify-web-template-management-utils';
 import { redirect } from 'next/navigation';
 import { processFormActions } from '@forms/SmsTemplateForm/server-action';
 import { TemplateDto } from 'nhs-notify-backend-client';
+import { ErrorCodes } from '@utils/error-codes';
 
 jest.mock('@utils/amplify-utils');
 jest.mock('@utils/form-actions');
@@ -88,6 +89,29 @@ describe('CreateSmsTemplate server actions', () => {
     });
   });
 
+  it('create-sms-template - should return response when when template message contains unsupported personalisation', async () => {
+    const response = await processFormActions(
+      initialState,
+      getMockFormData({
+        'form-id': 'create-sms-template',
+        smsTemplateName: 'template-name',
+        smsTemplateMessage: 'a template message containing ((date))',
+      })
+    );
+
+    expect(response).toEqual({
+      ...initialState,
+      errorState: {
+        formErrors: [],
+        fieldErrors: {
+          smsTemplateMessage: [
+            ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+          ],
+        },
+      },
+    });
+  });
+
   test('should save the template and redirect', async () => {
     saveTemplateMock.mockResolvedValue({
       ...initialState,
diff --git a/frontend/src/__tests__/components/molecules/NhsNotifyErrorSummary.test.tsx b/frontend/src/__tests__/components/molecules/NhsNotifyErrorSummary.test.tsx
index fbfddf8d1..659917b45 100644
--- a/frontend/src/__tests__/components/molecules/NhsNotifyErrorSummary.test.tsx
+++ b/frontend/src/__tests__/components/molecules/NhsNotifyErrorSummary.test.tsx
@@ -1,5 +1,6 @@
 import { render, screen, waitFor } from '@testing-library/react';
 import { NhsNotifyErrorSummary } from '@molecules/NhsNotifyErrorSummary/NhsNotifyErrorSummary';
+import { ErrorCodes } from '@utils/error-codes';
 
 const focusMock = jest.spyOn(window.HTMLElement.prototype, 'focus');
 const scrollIntoViewMock = jest.spyOn(
@@ -25,7 +26,10 @@ test('Renders NhsNotifyErrorSummary correctly with errors', async () => {
       errorState={{
         fieldErrors: {
           'radios-id': ['Radio error 1', 'Radio error 2'],
-          'select-id': ['Select error'],
+          'select-id': [
+            'Select error',
+            ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+          ],
         },
         formErrors: ['Form error', 'Form error 2'],
       }}
diff --git a/frontend/src/__tests__/components/molecules/__snapshots__/NhsNotifyErrorSummary.test.tsx.snap b/frontend/src/__tests__/components/molecules/__snapshots__/NhsNotifyErrorSummary.test.tsx.snap
index c9c9837d0..3956bb438 100644
--- a/frontend/src/__tests__/components/molecules/__snapshots__/NhsNotifyErrorSummary.test.tsx.snap
+++ b/frontend/src/__tests__/components/molecules/__snapshots__/NhsNotifyErrorSummary.test.tsx.snap
@@ -22,7 +22,14 @@ exports[`Renders NhsNotifyErrorSummary correctly with errors 1`] = `
         <a
           href="#radios-id"
         >
-          Radio error 1, Radio error 2
+          Radio error 1
+        </a>
+      </li>
+      <li>
+        <a
+          href="#radios-id"
+        >
+          Radio error 2
         </a>
       </li>
       <li>
@@ -32,6 +39,61 @@ exports[`Renders NhsNotifyErrorSummary correctly with errors 1`] = `
           Select error
         </a>
       </li>
+      <li>
+        <a
+          href="#select-id"
+        >
+          <div
+            class="nhsuk-u-margin-top-1 nhsuk-u-margin-bottom-4"
+          >
+            You cannot use the following custom personalisation fields in your message:
+          </div>
+          <ul
+            class="nhsuk-list nhsuk-list--bullet"
+          >
+            <li
+              class="nhsuk-u-margin-bottom-0"
+            >
+              date
+            </li>
+            <li
+              class="nhsuk-u-margin-bottom-0"
+            >
+              address_line_1
+            </li>
+            <li
+              class="nhsuk-u-margin-bottom-0"
+            >
+              address_line_2
+            </li>
+            <li
+              class="nhsuk-u-margin-bottom-0"
+            >
+              address_line_3
+            </li>
+            <li
+              class="nhsuk-u-margin-bottom-0"
+            >
+              address_line_4
+            </li>
+            <li
+              class="nhsuk-u-margin-bottom-0"
+            >
+              address_line_5
+            </li>
+            <li
+              class="nhsuk-u-margin-bottom-0"
+            >
+              address_line_6
+            </li>
+            <li
+              class="nhsuk-u-margin-bottom-0"
+            >
+              address_line_7
+            </li>
+          </ul>
+        </a>
+      </li>
       <li>
         <span
           class="nhsuk-error-message"
diff --git a/frontend/src/__tests__/components/molecules/__snapshots__/Personalisation.test.tsx.snap b/frontend/src/__tests__/components/molecules/__snapshots__/Personalisation.test.tsx.snap
index 8fbd58d3d..06f4cc3b6 100644
--- a/frontend/src/__tests__/components/molecules/__snapshots__/Personalisation.test.tsx.snap
+++ b/frontend/src/__tests__/components/molecules/__snapshots__/Personalisation.test.tsx.snap
@@ -66,9 +66,6 @@ exports[`Personalisation component matches snapshot 1`] = `
         <li>
           ((nhsNumber))
         </li>
-        <li>
-          ((date))
-        </li>
       </ul>
       <p>
         Make sure your personalisation fields exactly match the PDS personalisation fields. This includes using the correct order of upper and lower case letters.
diff --git a/frontend/src/components/atoms/NHSNotifyTextArea/NHSNotifyTextArea.tsx b/frontend/src/components/atoms/NHSNotifyTextArea/NHSNotifyTextArea.tsx
new file mode 100644
index 000000000..d749c5a4b
--- /dev/null
+++ b/frontend/src/components/atoms/NHSNotifyTextArea/NHSNotifyTextArea.tsx
@@ -0,0 +1,40 @@
+import React, { HTMLProps, JSX } from 'react';
+import classNames from 'classnames';
+import { Label, ErrorMessage } from 'nhsuk-react-components';
+
+export type FormElementProps = {
+  id: string;
+  textAreaProps: HTMLProps<HTMLTextAreaElement>;
+  label: string;
+  error?: string | JSX.Element;
+};
+
+const NHSNotifyTextArea = (props: FormElementProps): JSX.Element => {
+  const { id, label, error, textAreaProps } = props;
+  const labelID = `${id}--label`;
+  const errorID = `${id}--error-message`;
+
+  return (
+    <div
+      className={classNames('nhsuk-form-group', {
+        'nhsuk-form-group--error': error,
+      })}
+    >
+      <Label id={labelID} htmlFor={id} size='s'>
+        {label}
+      </Label>
+      {error ? <ErrorMessage id={errorID}>{error}</ErrorMessage> : null}
+      <textarea
+        className={classNames('nhsuk-textarea', {
+          'nhsuk-textarea--error': error,
+        })}
+        aria-describedby={error ? errorID : undefined}
+        id={id}
+        name={id}
+        {...textAreaProps}
+      />
+    </div>
+  );
+};
+
+export default NHSNotifyTextArea;
diff --git a/frontend/src/components/forms/EmailTemplateForm/EmailTemplateForm.tsx b/frontend/src/components/forms/EmailTemplateForm/EmailTemplateForm.tsx
index 684553008..68ffce0cc 100644
--- a/frontend/src/components/forms/EmailTemplateForm/EmailTemplateForm.tsx
+++ b/frontend/src/components/forms/EmailTemplateForm/EmailTemplateForm.tsx
@@ -1,7 +1,7 @@
 'use client';
 
 import { FC, useActionState, useState } from 'react';
-import { TextInput, HintText, Label, Textarea } from 'nhsuk-react-components';
+import { TextInput, HintText, Label } from 'nhsuk-react-components';
 import {
   $EmailTemplateFormSchema,
   processFormActions,
@@ -26,6 +26,8 @@ import { validate } from '@utils/client-validate-form';
 import Link from 'next/link';
 import classNames from 'classnames';
 import NotifyBackLink from '@atoms/NHSNotifyBackLink/NHSNotifyBackLink';
+import NHSNotifyTextArea from '@atoms/NHSNotifyTextArea/NHSNotifyTextArea';
+import { renderErrorItem } from '@molecules/NhsNotifyErrorItem/NHSNotifyErrorItem';
 
 export const EmailTemplateForm: FC<
   PageComponentProps<CreateUpdateEmailTemplate | EmailTemplate>
@@ -63,8 +65,15 @@ export const EmailTemplateForm: FC<
   const templateSubjectLineError =
     errorState?.fieldErrors?.emailTemplateSubjectLine?.join(', ');
 
-  const templateMessageError =
-    errorState?.fieldErrors?.emailTemplateMessage?.join(', ');
+  const hasTemplateMessageError =
+    (errorState?.fieldErrors?.emailTemplateMessage?.length ?? 0) > 0;
+  const templateMessageError = hasTemplateMessageError ? (
+    <>
+      {errorState?.fieldErrors?.emailTemplateMessage.map((error) =>
+        renderErrorItem(error)
+      )}
+    </>
+  ) : undefined;
 
   const editMode = 'id' in initialState;
 
@@ -135,17 +144,16 @@ export const EmailTemplateForm: FC<
                 />
               </div>
               <div className='nhsuk-form-group nhsuk-u-margin-bottom-8'>
-                <Textarea
+                <NHSNotifyTextArea
                   label={templateMessageLabelText}
-                  labelProps={{ size: 's' }}
                   id='emailTemplateMessage'
-                  rows={12}
-                  onChange={emailTemplateMessageHandler}
-                  value={emailTemplateMessage}
+                  textAreaProps={{
+                    rows: 12,
+                    onChange: emailTemplateMessageHandler,
+                    value: emailTemplateMessage,
+                    autoComplete: 'off',
+                  }}
                   error={templateMessageError}
-                  errorProps={{ id: 'emailTemplateMessage--error-message' }}
-                  data-testid='emailTemplateMessage-input'
-                  autoComplete='off'
                 />
               </div>
               <NHSNotifyButton
diff --git a/frontend/src/components/forms/EmailTemplateForm/server-action.ts b/frontend/src/components/forms/EmailTemplateForm/server-action.ts
index dbc7f897a..731f33384 100644
--- a/frontend/src/components/forms/EmailTemplateForm/server-action.ts
+++ b/frontend/src/components/forms/EmailTemplateForm/server-action.ts
@@ -6,8 +6,12 @@ import {
 import { z } from 'zod';
 import { createTemplate, saveTemplate } from '@utils/form-actions';
 import { redirect, RedirectType } from 'next/navigation';
-import { MAX_EMAIL_CHARACTER_LENGTH } from '@utils/constants';
+import {
+  MAX_EMAIL_CHARACTER_LENGTH,
+  INVALID_PERSONALISATION_FIELDS,
+} from '@utils/constants';
 import content from '@content/content';
+import { ErrorCodes } from '@utils/error-codes';
 
 const {
   components: {
@@ -30,7 +34,16 @@ export const $EmailTemplateFormSchema = z.object({
     })
     .refine((templateMessage) => !templateMessage.includes('http://'), {
       message: form.emailTemplateMessage.error.insecureLink,
-    }),
+    })
+    .refine(
+      (templateMessage) =>
+        !INVALID_PERSONALISATION_FIELDS.some((personalisationFieldName) =>
+          templateMessage.includes(`((${personalisationFieldName}))`)
+        ),
+      {
+        message: ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+      }
+    ),
 });
 
 export async function processFormActions(
diff --git a/frontend/src/components/forms/NhsAppTemplateForm/NhsAppTemplateForm.tsx b/frontend/src/components/forms/NhsAppTemplateForm/NhsAppTemplateForm.tsx
index 5b1e17531..db2e0da7c 100644
--- a/frontend/src/components/forms/NhsAppTemplateForm/NhsAppTemplateForm.tsx
+++ b/frontend/src/components/forms/NhsAppTemplateForm/NhsAppTemplateForm.tsx
@@ -1,7 +1,7 @@
 'use client';
 
 import { FC, useActionState, useState } from 'react';
-import { TextInput, HintText, Label, Textarea } from 'nhsuk-react-components';
+import { TextInput, HintText, Label } from 'nhsuk-react-components';
 import {
   $CreateNhsAppTemplateSchema,
   processFormActions,
@@ -28,6 +28,8 @@ import Link from 'next/link';
 import classNames from 'classnames';
 import { MarkdownContent } from '@molecules/MarkdownContent/MarkdownContent';
 import NotifyBackLink from '@atoms/NHSNotifyBackLink/NHSNotifyBackLink';
+import NHSNotifyTextArea from '@atoms/NHSNotifyTextArea/NHSNotifyTextArea';
+import { renderErrorItem } from '@molecules/NhsNotifyErrorItem/NHSNotifyErrorItem';
 
 export const NhsAppTemplateForm: FC<
   PageComponentProps<NHSAppTemplate | CreateUpdateNHSAppTemplate>
@@ -59,8 +61,15 @@ export const NhsAppTemplateForm: FC<
   const templateNameError =
     errorState?.fieldErrors?.nhsAppTemplateName?.join(', ');
 
-  const templateMessageError =
-    errorState?.fieldErrors?.nhsAppTemplateMessage?.join(', ');
+  const hasTemplateMessageError =
+    (errorState?.fieldErrors?.nhsAppTemplateMessage?.length ?? 0) > 0;
+  const templateMessageError = hasTemplateMessageError ? (
+    <>
+      {errorState?.fieldErrors?.nhsAppTemplateMessage.map((error) =>
+        renderErrorItem(error)
+      )}
+    </>
+  ) : undefined;
 
   const editMode = 'id' in initialState;
 
@@ -108,17 +117,17 @@ export const NhsAppTemplateForm: FC<
                 />
               </div>
               <div className='nhsuk-form-group nhsuk-u-margin-bottom-6'>
-                <Textarea
+                <NHSNotifyTextArea
                   label={templateMessageLabelText}
-                  labelProps={{ size: 's' }}
                   id='nhsAppTemplateMessage'
-                  maxLength={5000}
-                  rows={12}
-                  onChange={nhsAppMessageHandler}
-                  defaultValue={nhsAppTemplateMessage}
+                  textAreaProps={{
+                    rows: 12,
+                    maxLength: 5000,
+                    onChange: nhsAppMessageHandler,
+                    defaultValue: nhsAppTemplateMessage,
+                    autoComplete: 'off',
+                  }}
                   error={templateMessageError}
-                  errorProps={{ id: 'nhsAppTemplateMessage--error-message' }}
-                  autoComplete='off'
                 />
                 <JsEnabled>
                   <MarkdownContent
diff --git a/frontend/src/components/forms/NhsAppTemplateForm/server-action.ts b/frontend/src/components/forms/NhsAppTemplateForm/server-action.ts
index bbef5f83a..72a4f6f3e 100644
--- a/frontend/src/components/forms/NhsAppTemplateForm/server-action.ts
+++ b/frontend/src/components/forms/NhsAppTemplateForm/server-action.ts
@@ -7,7 +7,9 @@ import {
 import { z } from 'zod';
 import { saveTemplate, createTemplate } from '@utils/form-actions';
 import { redirect, RedirectType } from 'next/navigation';
+import { INVALID_PERSONALISATION_FIELDS } from '@utils/constants';
 import content from '@content/content';
+import { ErrorCodes } from '@utils/error-codes';
 
 const {
   components: {
@@ -49,6 +51,15 @@ export const $CreateNhsAppTemplateSchema = z.object({
     .refine(
       (templateMessage) => !hasInvalidCharactersInLinks(templateMessage),
       { message: form.nhsAppTemplateMessage.error.invalidUrlCharacter }
+    )
+    .refine(
+      (templateMessage) =>
+        !INVALID_PERSONALISATION_FIELDS.some((personalisationFieldName) =>
+          templateMessage.includes(`((${personalisationFieldName}))`)
+        ),
+      {
+        message: ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+      }
     ),
 });
 
diff --git a/frontend/src/components/forms/SmsTemplateForm/SmsTemplateForm.tsx b/frontend/src/components/forms/SmsTemplateForm/SmsTemplateForm.tsx
index 8d22081e3..fa2d76f16 100644
--- a/frontend/src/components/forms/SmsTemplateForm/SmsTemplateForm.tsx
+++ b/frontend/src/components/forms/SmsTemplateForm/SmsTemplateForm.tsx
@@ -5,7 +5,7 @@ import { useTextInput } from '@hooks/use-text-input.hook';
 import { MessageFormatting } from '@molecules/MessageFormatting/MessageFormatting';
 import { NHSNotifyFormWrapper } from '@molecules/NHSNotifyFormWrapper/NHSNotifyFormWrapper';
 import { Personalisation } from '@molecules/Personalisation/Personalisation';
-import { HintText, Label, Textarea, TextInput } from 'nhsuk-react-components';
+import { HintText, Label, TextInput } from 'nhsuk-react-components';
 import {
   CreateUpdateSMSTemplate,
   ErrorState,
@@ -27,6 +27,8 @@ import Link from 'next/link';
 import classNames from 'classnames';
 import { ContentRenderer } from '@molecules/ContentRenderer/ContentRenderer';
 import NotifyBackLink from '@atoms/NHSNotifyBackLink/NHSNotifyBackLink';
+import NHSNotifyTextArea from '@atoms/NHSNotifyTextArea/NHSNotifyTextArea';
+import { renderErrorItem } from '@molecules/NhsNotifyErrorItem/NHSNotifyErrorItem';
 
 export const SmsTemplateForm: FC<
   PageComponentProps<SMSTemplate | CreateUpdateSMSTemplate>
@@ -48,8 +50,15 @@ export const SmsTemplateForm: FC<
   const templateNameError =
     errorState?.fieldErrors?.smsTemplateName?.join(', ');
 
-  const templateMessageError =
-    errorState?.fieldErrors?.smsTemplateMessage?.join(', ');
+  const hasTemplateMessageError =
+    (errorState?.fieldErrors?.smsTemplateMessage?.length ?? 0) > 0;
+  const templateMessageError = hasTemplateMessageError ? (
+    <>
+      {errorState?.fieldErrors?.smsTemplateMessage.map((error) =>
+        renderErrorItem(error)
+      )}
+    </>
+  ) : undefined;
 
   const editMode = 'id' in initialState;
 
@@ -107,17 +116,17 @@ export const SmsTemplateForm: FC<
                 />
               </div>
               <div className='nhsuk-form-group nhsuk-u-margin-bottom-6'>
-                <Textarea
-                  id='smsTemplateMessage'
+                <NHSNotifyTextArea
                   label={templateMessageLabelText}
-                  labelProps={{ size: 's' }}
-                  defaultValue={smsTemplateMessage}
-                  onChange={smsTemplateMessageHandler}
-                  maxLength={MAX_SMS_CHARACTER_LENGTH}
-                  rows={12}
+                  id='smsTemplateMessage'
+                  textAreaProps={{
+                    rows: 12,
+                    onChange: smsTemplateMessageHandler,
+                    defaultValue: smsTemplateMessage,
+                    autoComplete: 'off',
+                    maxLength: MAX_SMS_CHARACTER_LENGTH,
+                  }}
                   error={templateMessageError}
-                  errorProps={{ id: 'smsTemplateMessage--error-message' }}
-                  autoComplete='off'
                 />
                 <JsEnabled>
                   <ContentRenderer
diff --git a/frontend/src/components/forms/SmsTemplateForm/server-action.ts b/frontend/src/components/forms/SmsTemplateForm/server-action.ts
index f3b5e1914..fea0b084a 100644
--- a/frontend/src/components/forms/SmsTemplateForm/server-action.ts
+++ b/frontend/src/components/forms/SmsTemplateForm/server-action.ts
@@ -6,8 +6,12 @@ import {
 import { z } from 'zod';
 import { saveTemplate, createTemplate } from '@utils/form-actions';
 import { redirect, RedirectType } from 'next/navigation';
-import { MAX_SMS_CHARACTER_LENGTH } from '@utils/constants';
+import {
+  MAX_SMS_CHARACTER_LENGTH,
+  INVALID_PERSONALISATION_FIELDS,
+} from '@utils/constants';
 import content from '@content/content';
+import { ErrorCodes } from '@utils/error-codes';
 
 const {
   components: {
@@ -27,7 +31,16 @@ export const $CreateSmsTemplateSchema = z.object({
     })
     .refine((templateMessage) => !templateMessage.includes('http://'), {
       message: form.smsTemplateMessage.error.insecureLink,
-    }),
+    })
+    .refine(
+      (templateMessage) =>
+        !INVALID_PERSONALISATION_FIELDS.some((personalisationFieldName) =>
+          templateMessage.includes(`((${personalisationFieldName}))`)
+        ),
+      {
+        message: ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME,
+      }
+    ),
 });
 
 export async function processFormActions(
diff --git a/frontend/src/components/molecules/NhsNotifyErrorItem/NHSNotifyErrorItem.tsx b/frontend/src/components/molecules/NhsNotifyErrorItem/NHSNotifyErrorItem.tsx
new file mode 100644
index 000000000..45c8a7b20
--- /dev/null
+++ b/frontend/src/components/molecules/NhsNotifyErrorItem/NHSNotifyErrorItem.tsx
@@ -0,0 +1,27 @@
+import { JSX } from 'react';
+import { templateMessageContainsInvalidPersonalisationErrorText } from '@content/content';
+import { INVALID_PERSONALISATION_FIELDS } from '@utils/constants';
+import { ErrorCodes } from '@utils/error-codes';
+
+const errorComponents: Record<string, JSX.Element> = {
+  [ErrorCodes.MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME]: (
+    <>
+      <div className='nhsuk-u-margin-top-1 nhsuk-u-margin-bottom-4'>
+        {templateMessageContainsInvalidPersonalisationErrorText}
+      </div>
+      <ul className='nhsuk-list nhsuk-list--bullet'>
+        {INVALID_PERSONALISATION_FIELDS.map((item) => (
+          <li
+            key={`personalisation-field-${item.toLowerCase().replace('_', '')}`}
+            className='nhsuk-u-margin-bottom-0'
+          >
+            {item}
+          </li>
+        ))}
+      </ul>
+    </>
+  ),
+};
+
+export const renderErrorItem = (error: string) =>
+  errorComponents[error] || error;
diff --git a/frontend/src/components/molecules/NhsNotifyErrorSummary/NhsNotifyErrorSummary.tsx b/frontend/src/components/molecules/NhsNotifyErrorSummary/NhsNotifyErrorSummary.tsx
index 2aa62e2bd..5ba1561d2 100644
--- a/frontend/src/components/molecules/NhsNotifyErrorSummary/NhsNotifyErrorSummary.tsx
+++ b/frontend/src/components/molecules/NhsNotifyErrorSummary/NhsNotifyErrorSummary.tsx
@@ -2,6 +2,7 @@ import { ErrorSummary, HintText } from 'nhsuk-react-components';
 import { ErrorState } from 'nhs-notify-web-template-management-utils';
 import { FC, HTMLProps, useEffect, useRef } from 'react';
 import content from '@content/content';
+import { renderErrorItem } from '@molecules/NhsNotifyErrorItem/NHSNotifyErrorItem';
 
 const UnlinkedErrorSummaryItem: FC<HTMLProps<HTMLSpanElement>> = (props) => (
   <li>
@@ -33,6 +34,19 @@ export const NhsNotifyErrorSummary = ({
 
   const { fieldErrors, formErrors } = errorState;
 
+  const renderedFieldErrors =
+    fieldErrors &&
+    Object.entries(fieldErrors).map(([id, errors]) =>
+      errors.map((error) => (
+        <ErrorSummary.Item
+          href={`#${id}`}
+          key={`field-error-summary-${id}-${error.slice(0, 5)}`}
+        >
+          {renderErrorItem(error)}
+        </ErrorSummary.Item>
+      ))
+    );
+
   return (
     <ErrorSummary ref={errorSummaryRef}>
       <ErrorSummary.Title data-testid='error-summary'>
@@ -40,15 +54,7 @@ export const NhsNotifyErrorSummary = ({
       </ErrorSummary.Title>
       {hint && <HintText>{hint}</HintText>}
       <ErrorSummary.List>
-        {fieldErrors &&
-          Object.entries(fieldErrors).map(([id, errors]) => (
-            <ErrorSummary.Item
-              href={`#${id}`}
-              key={`field-error-summary-${id}`}
-            >
-              {errors.join(', ')}
-            </ErrorSummary.Item>
-          ))}
+        {renderedFieldErrors}
         {formErrors &&
           formErrors.map((error, id) => (
             <UnlinkedErrorSummaryItem key={`form-error-summary-${id}`}>
diff --git a/frontend/src/content/content.ts b/frontend/src/content/content.ts
index fae6bab92..27b6f9f2d 100644
--- a/frontend/src/content/content.ts
+++ b/frontend/src/content/content.ts
@@ -18,6 +18,9 @@ const templateMessageTooLong = 'Template message too long';
 const templateMessageHasInsecureLink = 'URLs must start with https://';
 const selectAnOption = 'Select an option';
 
+export const templateMessageContainsInvalidPersonalisationErrorText =
+  'You cannot use the following custom personalisation fields in your message:';
+
 const header = {
   serviceName: 'Notify',
   logoLink: {
@@ -127,7 +130,6 @@ const personalisation: {
             '((firstName))',
             '((lastName))',
             '((nhsNumber))',
-            '((date))',
           ]),
         },
         {
diff --git a/frontend/src/utils/constants.ts b/frontend/src/utils/constants.ts
index 3dfb115ca..b5ed7bdae 100644
--- a/frontend/src/utils/constants.ts
+++ b/frontend/src/utils/constants.ts
@@ -1,2 +1,13 @@
 export const MAX_SMS_CHARACTER_LENGTH = 918 as const;
 export const MAX_EMAIL_CHARACTER_LENGTH = 100_000 as const;
+
+export const INVALID_PERSONALISATION_FIELDS = [
+  'date',
+  'address_line_1',
+  'address_line_2',
+  'address_line_3',
+  'address_line_4',
+  'address_line_5',
+  'address_line_6',
+  'address_line_7',
+] as const;
diff --git a/frontend/src/utils/error-codes.ts b/frontend/src/utils/error-codes.ts
new file mode 100644
index 000000000..0a043835f
--- /dev/null
+++ b/frontend/src/utils/error-codes.ts
@@ -0,0 +1,4 @@
+export const ErrorCodes = {
+  MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME:
+    'MESSAGE_CONTAINS_INVALID_PERSONALISATION_FIELD_NAME',
+} as const;
diff --git a/tests/test-team/template-mgmt-component-tests/email/template-mgmt-create-email-page.component.spec.ts b/tests/test-team/template-mgmt-component-tests/email/template-mgmt-create-email-page.component.spec.ts
index c254eb28b..b786f8219 100644
--- a/tests/test-team/template-mgmt-component-tests/email/template-mgmt-create-email-page.component.spec.ts
+++ b/tests/test-team/template-mgmt-component-tests/email/template-mgmt-create-email-page.component.spec.ts
@@ -373,5 +373,39 @@ test.describe('Create Email message template Page', () => {
 
       await expect(createEmailTemplatePage.messageTextArea).toBeFocused();
     });
+
+    test('when user submits form with unsupported personalisation, then an error is displayed', async ({
+      page,
+    }) => {
+      const errorMessage =
+        'You cannot use the following custom personalisation fields in your message';
+
+      const createEmailTemplatePage = new TemplateMgmtCreateEmailPage(page);
+
+      await createEmailTemplatePage.loadPage();
+
+      await createEmailTemplatePage.nameInput.fill('template-name');
+
+      await createEmailTemplatePage.subjectLineInput.fill(
+        'template-subject-line'
+      );
+
+      await createEmailTemplatePage.messageTextArea.fill(
+        'a template message containing ((date))'
+      );
+
+      await createEmailTemplatePage.clickSaveAndPreviewButton();
+
+      const emailMessageErrorLink =
+        createEmailTemplatePage.errorSummary.locator(
+          '[href="#emailTemplateMessage"]'
+        );
+
+      await expect(emailMessageErrorLink).toContainText(errorMessage);
+
+      await emailMessageErrorLink.click();
+
+      await expect(createEmailTemplatePage.messageTextArea).toBeFocused();
+    });
   });
 });
diff --git a/tests/test-team/template-mgmt-component-tests/nhs-app/template-mgmt-create-nhs-app-template-page.component.spec.ts b/tests/test-team/template-mgmt-component-tests/nhs-app/template-mgmt-create-nhs-app-template-page.component.spec.ts
index 69cd8ab51..6527253b5 100644
--- a/tests/test-team/template-mgmt-component-tests/nhs-app/template-mgmt-create-nhs-app-template-page.component.spec.ts
+++ b/tests/test-team/template-mgmt-component-tests/nhs-app/template-mgmt-create-nhs-app-template-page.component.spec.ts
@@ -179,6 +179,29 @@ test.describe('Create NHS App Template Page', () => {
     ).toHaveText(['URLs must start with https://']);
   });
 
+  test('Validate error messages on the create NHS App message template page with unsupported personalisation in message', async ({
+    page,
+  }) => {
+    const createTemplatePage = new TemplateMgmtCreateNhsAppPage(page);
+
+    await createTemplatePage.loadPage();
+    await expect(createTemplatePage.pageHeading).toHaveText(
+      'Create NHS App message template'
+    );
+    await page.locator('[id="nhsAppTemplateName"]').fill('template-name');
+    await page
+      .locator('[id="nhsAppTemplateMessage"]')
+      .fill('a template message containing ((date))');
+    await createTemplatePage.clickSaveAndPreviewButton();
+    await expect(page.locator('.nhsuk-error-summary')).toBeVisible();
+
+    await expect(
+      page.locator('ul[class="nhsuk-list nhsuk-error-summary__list"] > li')
+    ).toContainText([
+      'You cannot use the following custom personalisation fields in your message',
+    ]);
+  });
+
   test('Validate error messages on the create NHS App message template page with angle brackets in linked url', async ({
     page,
   }) => {
diff --git a/tests/test-team/template-mgmt-component-tests/sms/template-mgmt-create-sms-page.component.spec.ts b/tests/test-team/template-mgmt-component-tests/sms/template-mgmt-create-sms-page.component.spec.ts
index 6f912b2f3..e82b09a41 100644
--- a/tests/test-team/template-mgmt-component-tests/sms/template-mgmt-create-sms-page.component.spec.ts
+++ b/tests/test-team/template-mgmt-component-tests/sms/template-mgmt-create-sms-page.component.spec.ts
@@ -340,5 +340,33 @@ test.describe('Create SMS message template Page', () => {
 
       await expect(createSmsTemplatePage.messageTextArea).toBeFocused();
     });
+
+    test('when user submits form with unsupported personalisation, then an error is displayed', async ({
+      page,
+    }) => {
+      const errorMessage =
+        'You cannot use the following custom personalisation fields in your message';
+
+      const createSmsTemplatePage = new TemplateMgmtCreateSmsPage(page);
+
+      await createSmsTemplatePage.loadPage();
+
+      await createSmsTemplatePage.nameInput.fill('template-name');
+      await createSmsTemplatePage.messageTextArea.fill(
+        'a template message containing ((date))'
+      );
+
+      await createSmsTemplatePage.clickSaveAndPreviewButton();
+
+      const smsMessageErrorLink = createSmsTemplatePage.errorSummary.locator(
+        '[href="#smsTemplateMessage"]'
+      );
+
+      await expect(smsMessageErrorLink).toContainText(errorMessage);
+
+      await smsMessageErrorLink.click();
+
+      await expect(createSmsTemplatePage.messageTextArea).toBeFocused();
+    });
   });
 });