diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 682e7229..8ee36f40 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -1,21 +1,30 @@
 ## When copying this to a new ORC repository...
 ##
-## 1) Create environments for dev, test, pre-prod and prod (https://github.com/nhsconnect/<repo>/settings/environments).
+## 1) Visit https://github.com/nhsconnect/<repo>/settings/environments and create environments:
+## - dev
+## - test
+## - test-apply
+## - pre-prod
+## - pre-prod-apply
+## - prod
+## - prod-apply
 ##
 ## 2) For each environment, add the following secrets:
-## - BACKEND_BUCKET
-## - BACKEND_KEY
-## - IAM_ROLE_READONLY
+## - IAM_ROLE
+## - TF_BACKEND_BUCKET
+## - TF_BACKEND_DYNAMODB_TABLE
+## - TF_BACKEND_KEY
 ##
 ## 3) Create the following repository secret (https://github.com/nhsconnect/<repo>/settings/secrets/actions):
 ## - ECR_REPOSITORY_NAME
 ##
 ## 4) Edit the ## REPOSITORY SPECIFIC ## section below.
 
-name: Terraform Plan
+name: PR Checks
 on:
   pull_request:
-    branches: [ main ]
+    branches:
+      - main
 
 permissions:
   contents: read       # Required for actions/checkout
@@ -42,7 +51,7 @@ jobs:
     strategy:
       matrix:
         environment: [dev, test, pre-prod, prod]
-    name: ${{ matrix.environment }}
+    name: Terraform Plan (${{ matrix.environment }})
     runs-on: ubuntu-latest
     environment: ${{ matrix.environment }}
     defaults:
@@ -58,7 +67,7 @@ jobs:
       - name: Configure AWS Credentials
         uses: aws-actions/configure-aws-credentials@v4
         with:
-          role-to-assume: ${{ secrets.IAM_ROLE_READONLY }}
+          role-to-assume: ${{ secrets.IAM_ROLE }}
           aws-region: eu-west-2
 
       - name: terraform fmt
diff --git a/src/api/patients/patient-details-controller.js b/src/api/patients/patient-details-controller.js
index 4faa2637..6571e352 100644
--- a/src/api/patients/patient-details-controller.js
+++ b/src/api/patients/patient-details-controller.js
@@ -6,7 +6,7 @@ import {
   getCurrentConversationIdForPatient,
   getMessageIdsForConversation
 } from '../../services/database/ehr-conversation-repository';
-import { HealthRecordNotFoundError } from '../../errors/errors';
+import { HealthRecordNotFoundError, CoreNotFoundError } from '../../errors/errors';
 
 export const patientDetailsValidation = [
   param('nhsNumber')
@@ -52,6 +52,12 @@ export const patientDetailsController = async (req, res) => {
       return;
     }
 
+    if (err instanceof CoreNotFoundError) {
+      logInfo('Did not find a core message');
+      res.sendStatus(503);
+      return;
+    }
+
     logError('Could not retrieve patient health record', err);
     res.sendStatus(503);
   }
diff --git a/src/errors/errors.js b/src/errors/errors.js
index d2248b56..5b0ff569 100644
--- a/src/errors/errors.js
+++ b/src/errors/errors.js
@@ -12,7 +12,7 @@ export class HealthRecordNotFoundError extends Error {
   }
 }
 
-export class MessageNotFoundError extends Error {
+export class CoreNotFoundError extends Error {
   constructor(error) {
     super(errorMessages.MessageNotFound);
     logError(errorMessages.MessageNotFound, error);
diff --git a/src/services/database/__tests__/ehr-conversation-repository.integration.test.js b/src/services/database/__tests__/ehr-conversation-repository.integration.test.js
index cfecadf7..1e5124a3 100644
--- a/src/services/database/__tests__/ehr-conversation-repository.integration.test.js
+++ b/src/services/database/__tests__/ehr-conversation-repository.integration.test.js
@@ -17,7 +17,7 @@ import {
 import { createCore } from '../ehr-core-repository';
 import { EhrTransferTracker } from '../dynamo-ehr-transfer-tracker';
 import { markFragmentAsReceivedAndCreateItsParts } from '../ehr-fragment-repository';
-import { HealthRecordNotFoundError, MessageNotFoundError } from '../../../errors/errors';
+import { HealthRecordNotFoundError, CoreNotFoundError } from '../../../errors/errors';
 import moment from 'moment-timezone';
 
 jest.mock('../../../middleware/logging');
@@ -247,7 +247,7 @@ describe('ehr-conversation-repository', () => {
       // when
       await expect(() => getMessageIdsForConversation(conversationId))
         // then
-        .rejects.toThrowError(MessageNotFoundError);
+        .rejects.toThrowError(CoreNotFoundError);
     });
 
     it('should return health record extract message id given a conversation id for a small health record', async () => {
diff --git a/src/services/database/ehr-conversation-repository.js b/src/services/database/ehr-conversation-repository.js
index fee9b2f6..08ebd17d 100644
--- a/src/services/database/ehr-conversation-repository.js
+++ b/src/services/database/ehr-conversation-repository.js
@@ -2,7 +2,7 @@ import { ConversationStatus, HealthRecordStatus, RecordType } from '../../models
 import { logError, logInfo } from '../../middleware/logging';
 import { EhrTransferTracker } from './dynamo-ehr-transfer-tracker';
 import { buildConversationUpdateParams, isInCompleteStatus } from '../../models/conversation';
-import { HealthRecordNotFoundError, MessageNotFoundError } from '../../errors/errors';
+import { HealthRecordNotFoundError, CoreNotFoundError } from '../../errors/errors';
 import { isCore } from '../../models/core';
 import { isFragment } from '../../models/fragment';
 import { buildSoftDeleteUpdateParams } from '../../utilities/dynamodb-helper';
@@ -125,7 +125,7 @@ export const getMessageIdsForConversation = async (conversationId) => {
   const fragments = items.filter(isFragment);
 
   if (!core) {
-    throw new MessageNotFoundError();
+    throw new CoreNotFoundError();
   }
   const coreMessageId = core.InboundMessageId;
   const fragmentMessageIds = fragments.map((message) => message.InboundMessageId);