diff --git a/integration_tests/e2e/domainEvent.cy.ts b/integration_tests/e2e/domainEvent.cy.ts
new file mode 100644
index 0000000..e6fab6c
--- /dev/null
+++ b/integration_tests/e2e/domainEvent.cy.ts
@@ -0,0 +1,76 @@
+context('Domain Event checks', () => {
+  it('Basic Details Merge Alert', () => {
+    cy.visit('/basic-details/00000000-0000-0000-0000-100000000101')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Warning Details Merge Alert', () => {
+    cy.visit('/warning-details/00000000-0000-0000-0000-100000000101')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Warning Type Merge Alert', () => {
+    cy.visit('/warning-type/00000000-0000-0000-0000-100000000101')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Next Appointment Merge Alert', () => {
+    cy.visit('/next-appointment/00000000-0000-0000-0000-100000000101')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Check your report Merge Alert', () => {
+    cy.visit('/check-your-report/00000000-0000-0000-0000-100000000101')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Basic Details UnMerge Alert', () => {
+    cy.visit('/basic-details/00000000-0000-0000-0000-100000000102')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Warning Details UnMerge Alert', () => {
+    cy.visit('/warning-details/00000000-0000-0000-0000-100000000102')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Warning Type UnMerge Alert', () => {
+    cy.visit('/warning-type/00000000-0000-0000-0000-100000000102')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Next Appointment UnMerge Alert', () => {
+    cy.visit('/next-appointment/00000000-0000-0000-0000-100000000102')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Check your report UnMerge Alert', () => {
+    cy.visit('/check-your-report/00000000-0000-0000-0000-100000000102')
+    cy.get('#reviewAlert').should('exist')
+  })
+
+  it('Basic Details No Alert', () => {
+    cy.visit('/basic-details/00000000-0000-0000-0000-000000000001')
+    cy.get('#reviewAlert').should('not.exist')
+  })
+
+  it('Warning Details No Alert', () => {
+    cy.visit('/warning-details/00000000-0000-0000-0000-000000000001')
+    cy.get('#reviewAlert').should('not.exist')
+  })
+
+  it('Warning Type No Alert', () => {
+    cy.visit('/warning-type/00000000-0000-0000-0000-000000000001')
+    cy.get('#reviewAlert').should('not.exist')
+  })
+
+  it('Next Appointment No Alert', () => {
+    cy.visit('/next-appointment/00000000-0000-0000-0000-000000000001')
+    cy.get('#reviewAlert').should('not.exist')
+  })
+
+  it('Check your report No Alert', () => {
+    cy.visit('/check-your-report/00000000-0000-0000-0000-000000000001')
+    cy.get('#reviewAlert').should('not.exist')
+  })
+})
diff --git a/server/data/breachNoticeApiClient.ts b/server/data/breachNoticeApiClient.ts
index 5f37811..535199b 100644
--- a/server/data/breachNoticeApiClient.ts
+++ b/server/data/breachNoticeApiClient.ts
@@ -69,6 +69,8 @@ export interface BreachNotice {
   nextAppointmentSaved: boolean
   useDefaultAddress: boolean
   useDefaultReplyAddress: boolean
+  reviewRequiredDate: Date
+  reviewEvent: string
   breachNoticeContactList: BreachNoticeContact[]
   breachNoticeRequirementList: BreachNoticeRequirement[]
   optionalNumberChecked: boolean
diff --git a/server/views/pages/basic-details.njk b/server/views/pages/basic-details.njk
index 23211f1..53b3c30 100644
--- a/server/views/pages/basic-details.njk
+++ b/server/views/pages/basic-details.njk
@@ -59,6 +59,8 @@
             </div>
 
             <div class="govuk-grid-column-two-thirds">
+                {% include "partials/review-required.njk" %}
+
                 <h1 class="govuk-heading-l">Breach Notice - Basic Details</h1>
 
                 <h2 class="govuk-heading-m">Title and Full Name</h2>
diff --git a/server/views/pages/check-your-report.njk b/server/views/pages/check-your-report.njk
index 0ca837f..9c71db3 100644
--- a/server/views/pages/check-your-report.njk
+++ b/server/views/pages/check-your-report.njk
@@ -31,6 +31,8 @@
             </div>
 
             <div class="govuk-grid-column-two-thirds">
+                {% include "partials/review-required.njk" %}
+                
                 <h1 class="govuk-heading-x1">Breach Notice - Check Your Answers</h1>
 
                 <div class="govuk-summary-card">
diff --git a/server/views/pages/next-appointment.njk b/server/views/pages/next-appointment.njk
index cb2604e..1ccf97f 100644
--- a/server/views/pages/next-appointment.njk
+++ b/server/views/pages/next-appointment.njk
@@ -33,6 +33,7 @@
             </div>
 
             <div class="govuk-grid-column-two-thirds">
+              {% include "partials/review-required.njk" %}
 
                 <h1 class="govuk-heading-l">Breach Notice - Next Appointment</h1>
 
diff --git a/server/views/pages/warning-details.njk b/server/views/pages/warning-details.njk
index 73f9d8c..57e54e7 100644
--- a/server/views/pages/warning-details.njk
+++ b/server/views/pages/warning-details.njk
@@ -31,6 +31,7 @@
         {% include "pages/side-nav.njk" %}
       </div>
       <div class="govuk-grid-column-two-thirds">
+        {% include "partials/review-required.njk" %}
         <h1
           class="govuk-heading-x1">{{ applicationName + " - " + breachNotice.breachNoticeTypeDescription + " Details" }}</h1>
         <h2 class="govuk-heading-m">
diff --git a/server/views/pages/warning-type.njk b/server/views/pages/warning-type.njk
index c0dc74e..ba03411 100644
--- a/server/views/pages/warning-type.njk
+++ b/server/views/pages/warning-type.njk
@@ -5,85 +5,87 @@
 
 {% block content %}
 
-    {% from "moj/components/side-navigation/macro.njk" import mojSideNavigation %}
-    {% from "govuk/components/radios/macro.njk" import govukRadios %}
-    {% from "govuk/components/select/macro.njk" import govukSelect %}
-    {% from "govuk/components/button/macro.njk" import govukButton %}
-    {% from "moj/components/date-picker/macro.njk" import mojDatePicker %}
-    {% from "govuk/components/table/macro.njk" import govukTable %}
-    {% from "govuk/components/select/macro.njk" import govukSelect %}
+  {% from "moj/components/side-navigation/macro.njk" import mojSideNavigation %}
+  {% from "govuk/components/radios/macro.njk" import govukRadios %}
+  {% from "govuk/components/select/macro.njk" import govukSelect %}
+  {% from "govuk/components/button/macro.njk" import govukButton %}
+  {% from "moj/components/date-picker/macro.njk" import mojDatePicker %}
+  {% from "govuk/components/table/macro.njk" import govukTable %}
+  {% from "govuk/components/select/macro.njk" import govukSelect %}
 
-    <form method="post">
-        {% set errorList =[
-            { text: errorMessages.warningType.text, href: "#warning-type" } if errorMessages.warningType else None,
-            { text: errorMessages.sentenceType.text, href: "#sentence-type" } if errorMessages.sentenceType else None
-        ] | reject("undefined") %}
+  <form method="post">
+    {% set errorList =[
+      { text: errorMessages.warningType.text, href: "#warning-type" } if errorMessages.warningType else None,
+      { text: errorMessages.sentenceType.text, href: "#sentence-type" } if errorMessages.sentenceType else None
+    ] | reject("undefined") %}
 
-        {% if errorMessages | length > 0 %}
-            {% from "govuk/components/error-summary/macro.njk" import govukErrorSummary %}
-            {{ govukErrorSummary({ titleText: "There is a problem", errorList: errorList }) }}
-        {% endif %}
+    {% if errorMessages | length > 0 %}
+      {% from "govuk/components/error-summary/macro.njk" import govukErrorSummary %}
+      {{ govukErrorSummary({ titleText: "There is a problem", errorList: errorList }) }}
+    {% endif %}
 
-        <input type="hidden" name="_csrf" value="{{ csrfToken }}">
-        <div class="govuk-grid-row">
-            <div class="govuk-grid-column-one-third">
+    <input type="hidden" name="_csrf" value="{{ csrfToken }}">
+    <div class="govuk-grid-row">
+      <div class="govuk-grid-column-one-third">
 
-                {% include "pages/side-nav.njk" %}
+        {% include "pages/side-nav.njk" %}
 
-            </div>
+      </div>
 
-            <div class="govuk-grid-column-two-thirds">
-                <h1 class="govuk-heading-x1">Breach Notice - Warning Type</h1>
+      <div class="govuk-grid-column-two-thirds">
+        {% include "partials/review-required.njk" %}
 
-                {{ govukRadios({
-                    id: "warning-type",
-                    name: "warningType",
-                    fieldset: {
-                        legend: {
-                            text: "Select a Warning Type",
-                            isPageHeading: false,
-                            classes: "govuk-fieldset__legend--m"
-                        }
-                    },
-                    items: warningTypeRadioButtons,
-                    errorMessage: {
-                        text: errorMessages.warningType.text
-                    } if errorMessages.warningType.text
-                }) }}
+        <h1 class="govuk-heading-x1">Breach Notice - Warning Type</h1>
 
-                {{ govukSelect({
-                    id: "sentence-type",
-                    name: "sentenceType",
-                    label: {
-                        text: "Select the Sentence Type being enforced",
-                        classes: "govuk-fieldset__legend--m"
-                    },
-                    items: sentenceTypeSelectItems,
-                    errorMessage: {
-                        text: errorMessages.sentenceType.text
-                    } if errorMessages.sentenceType.text
-                }) }}
+        {{ govukRadios({
+          id: "warning-type",
+          name: "warningType",
+          fieldset: {
+            legend: {
+              text: "Select a Warning Type",
+              isPageHeading: false,
+              classes: "govuk-fieldset__legend--m"
+            }
+          },
+          items: warningTypeRadioButtons,
+          errorMessage: {
+            text: errorMessages.warningType.text
+          } if errorMessages.warningType.text
+        }) }}
 
-                <div class="moj-button-group">
-                  {{ govukButton({
-                    text: "Continue",
-                    preventDoubleClick: "true",
-                    type: "submit",
-                    attributes: {
-                      id: "continue-button"
-                    }
-                  }) }}
-                  {{ govukButton({
-                    text: "Save Progress and Close",
-                    href: "/basic-details/"+breachNotice.id,
-                    classes: "govuk-button--secondary",
-                    preventDoubleClick: "true",
-                    attributes: {
-                      id: "close-button"
-                    }
-                  }) }}
-                </div>
-            </div>
+        {{ govukSelect({
+          id: "sentence-type",
+          name: "sentenceType",
+          label: {
+            text: "Select the Sentence Type being enforced",
+            classes: "govuk-fieldset__legend--m"
+          },
+          items: sentenceTypeSelectItems,
+          errorMessage: {
+            text: errorMessages.sentenceType.text
+          } if errorMessages.sentenceType.text
+        }) }}
+
+        <div class="moj-button-group">
+          {{ govukButton({
+            text: "Continue",
+            preventDoubleClick: "true",
+            type: "submit",
+            attributes: {
+              id: "continue-button"
+            }
+          }) }}
+          {{ govukButton({
+            text: "Save Progress and Close",
+            href: "/basic-details/"+breachNotice.id,
+            classes: "govuk-button--secondary",
+            preventDoubleClick: "true",
+            attributes: {
+              id: "close-button"
+            }
+          }) }}
         </div>
-    </form>
+      </div>
+    </div>
+  </form>
 {% endblock %}
diff --git a/server/views/partials/review-required.njk b/server/views/partials/review-required.njk
new file mode 100644
index 0000000..fdcd62d
--- /dev/null
+++ b/server/views/partials/review-required.njk
@@ -0,0 +1,24 @@
+{%- from "moj/components/alert/macro.njk" import mojAlert -%}
+
+{% if breachNotice.reviewRequiredDate != null %}
+
+  {% set messageHtml %}
+    {% if breachNotice.reviewEvent == 'MERGE' %}
+      A Merge occurred on {{ breachNotice.reviewRequiredDate | toUserDate() }} in NDelius and important details have chaged. This report should be reviewed before proceeding. Please confirm all information or discard this report.
+    {% endif %}
+    {% if breachNotice.reviewEvent == 'UNMERGE' %}
+      A Unmerge occurred on {{ breachNotice.reviewRequiredDate | toUserDate() }} in NDelius and important details have chaged. This report should be reviewed before proceeding. Please confirm all information or discard this report.
+    {% endif %}
+  {% endset -%}
+
+  {{ mojAlert({
+    variant: "warning",
+    title: "Review Required",
+    showTitleAsHeading: true,
+    dismissible: false,
+    html: messageHtml,
+    attributes: {
+      id: "reviewAlert"
+    }
+  }) }}
+{% endif %}
diff --git a/wiremock/mappings/breach-notice-api.json b/wiremock/mappings/breach-notice-api.json
index b672b00..5ae71e2 100644
--- a/wiremock/mappings/breach-notice-api.json
+++ b/wiremock/mappings/breach-notice-api.json
@@ -749,6 +749,156 @@
         },
         "transformers": ["response-template"]
       }
+    },
+    {
+      "request": {
+        "url": "/breach-notice-api/breach-notice/00000000-0000-0000-0000-100000000101",
+        "method": "GET"
+      },
+      "response": {
+        "status": 200,
+        "jsonBody": {
+          "id": "00000000-0000-0000-0000-100000000101",
+          "crn": "X100504",
+          "titleAndFullName": "Mr Billy The Kid",
+          "dateOfLetter": "2025-01-01",
+          "referenceNumber": "REF0001",
+          "responseRequiredByDate": "2025-01-01",
+          "breachNoticeTypeCode": "BW",
+          "breachNoticeTypeDescription": "Breach Warning",
+          "breachConditionTypeCode": "BRE",
+          "breachConditionTypeDescription": "Breach",
+          "breachSentenceTypeCode": "CO",
+          "breachSentenceTypeDescription": "Community Order(s)",
+          "responsibleOfficer": "An Officer",
+          "contactNumber": "0892929187",
+          "nextAppointmentType": "App Type",
+          "nextAppointmentDate": "2025-01-01T12:34:56",
+          "nextAppointmentLocation": "Location",
+          "nextAppointmentOfficer": "Officer",
+          "nextAppointmentContact": "0292827177",
+          "completedDate": null,
+          "offenderAddress": {
+            "addressId": 12345,
+            "type": "Postal",
+            "buildingName": null,
+            "buildingNumber": "21",
+            "streetName": "Postal Street",
+            "district": "Postal District",
+            "townCity": "PostCity",
+            "county": "Postal County",
+            "postcode": "NE30 3ZZ"
+          },
+          "replyAddress": {
+            "addressId": 33333,
+            "type": "Postal",
+            "buildingName": null,
+            "buildingNumber": "21",
+            "streetName": "Reply Street",
+            "district": "Reply District",
+            "townCity": "Reply City",
+            "county": "Reply County",
+            "postcode": "NE22 3AA"
+          },
+          "basicDetailsSaved": true,
+          "warningTypeSaved": true,
+          "warningDetailsSaved": true,
+          "nextAppointmentSaved": true,
+          "useDefaultAddress": true,
+          "useDefaultReplyAddress": true,
+          "reviewRequiredDate": "2025-01-01T12:34:56",
+          "reviewEvent": "MERGE",
+          "breachNoticeContactList": [
+            {
+              "contactId": 1
+            }
+          ],
+          "breachNoticeRequirementList": [
+            {
+              "requirementId": 1
+            }
+          ]
+        },
+        "headers": {
+          "Content-Type": "application/json;charset=UTF-8"
+        },
+        "transformers": ["response-template"]
+      }
+    },
+    {
+      "request": {
+        "url": "/breach-notice-api/breach-notice/00000000-0000-0000-0000-100000000102",
+        "method": "GET"
+      },
+      "response": {
+        "status": 200,
+        "jsonBody": {
+          "id": "00000000-0000-0000-0000-100000000102",
+          "crn": "X100504",
+          "titleAndFullName": "Mr Billy The Kid",
+          "dateOfLetter": "2025-01-01",
+          "referenceNumber": "REF0001",
+          "responseRequiredByDate": "2025-01-01",
+          "breachNoticeTypeCode": "BW",
+          "breachNoticeTypeDescription": "Breach Warning",
+          "breachConditionTypeCode": "BRE",
+          "breachConditionTypeDescription": "Breach",
+          "breachSentenceTypeCode": "CO",
+          "breachSentenceTypeDescription": "Community Order(s)",
+          "responsibleOfficer": "An Officer",
+          "contactNumber": "0892929187",
+          "nextAppointmentType": "App Type",
+          "nextAppointmentDate": "2025-01-01T12:34:56",
+          "nextAppointmentLocation": "Location",
+          "nextAppointmentOfficer": "Officer",
+          "nextAppointmentContact": "0292827177",
+          "completedDate": null,
+          "offenderAddress": {
+            "addressId": 12345,
+            "type": "Postal",
+            "buildingName": null,
+            "buildingNumber": "21",
+            "streetName": "Postal Street",
+            "district": "Postal District",
+            "townCity": "PostCity",
+            "county": "Postal County",
+            "postcode": "NE30 3ZZ"
+          },
+          "replyAddress": {
+            "addressId": 33333,
+            "type": "Postal",
+            "buildingName": null,
+            "buildingNumber": "21",
+            "streetName": "Reply Street",
+            "district": "Reply District",
+            "townCity": "Reply City",
+            "county": "Reply County",
+            "postcode": "NE22 3AA"
+          },
+          "basicDetailsSaved": true,
+          "warningTypeSaved": true,
+          "warningDetailsSaved": true,
+          "nextAppointmentSaved": true,
+          "useDefaultAddress": true,
+          "useDefaultReplyAddress": true,
+          "reviewRequiredDate": "2025-01-01T12:34:56",
+          "reviewEvent": "UNMERGE",
+          "breachNoticeContactList": [
+            {
+              "contactId": 1
+            }
+          ],
+          "breachNoticeRequirementList": [
+            {
+              "requirementId": 1
+            }
+          ]
+        },
+        "headers": {
+          "Content-Type": "application/json;charset=UTF-8"
+        },
+        "transformers": ["response-template"]
+      }
     }
   ]
 }