diff --git a/.github/workflows/core-network-services-deployment.yml b/.github/workflows/core-network-services-deployment.yml
index 8900588ee..9297bae69 100644
--- a/.github/workflows/core-network-services-deployment.yml
+++ b/.github/workflows/core-network-services-deployment.yml
@@ -12,6 +12,7 @@ on:
       - 'terraform/modules/firewall-policy/**'
       - '!**.md'
       - '.github/workflows/core-network-services-deployment.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
   pull_request:
     branches:
       - main
@@ -21,6 +22,7 @@ on:
       - 'terraform/modules/core-monitoring/**'
       - '!**.md'
       - '.github/workflows/core-network-services-deployment.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
   workflow_dispatch:
 
 permissions:
@@ -38,5 +40,5 @@ jobs:
       working-directory: "terraform/environments/core-network-services"
       environment: production
     secrets:
-      modernisation_platform_environments: "${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}"
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
\ No newline at end of file
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
\ No newline at end of file
diff --git a/.github/workflows/core-security-deployment.yml b/.github/workflows/core-security-deployment.yml
index 6d4d39be9..d28ec5daa 100644
--- a/.github/workflows/core-security-deployment.yml
+++ b/.github/workflows/core-security-deployment.yml
@@ -11,6 +11,7 @@ on:
       - 'terraform/modules/core-monitoring/**'
       - '!**.md'
       - '.github/workflows/core-security-deployment.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
   pull_request:
     branches:
       - main
@@ -20,6 +21,7 @@ on:
       - 'terraform/modules/core-monitoring/**'
       - '!**.md'
       - '.github/workflows/core-security-deployment.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
   workflow_dispatch:
 
 permissions:
@@ -37,5 +39,5 @@ jobs:
       working-directory: "terraform/environments/core-security"
       environment: production
     secrets:
-      modernisation_platform_environments: "${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}"
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
\ No newline at end of file
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
\ No newline at end of file
diff --git a/.github/workflows/core-shared-services-deployment.yml b/.github/workflows/core-shared-services-deployment.yml
index 18a3f1fef..952fe6551 100644
--- a/.github/workflows/core-shared-services-deployment.yml
+++ b/.github/workflows/core-shared-services-deployment.yml
@@ -12,6 +12,7 @@ on:
       - 'terraform/modules/kms/**'
       - '!**.md'
       - '.github/workflows/core-shared-services-deployment.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
   pull_request:
     branches:
       - main
@@ -22,6 +23,7 @@ on:
       - 'terraform/modules/kms/**'
       - '!**.md'
       - '.github/workflows/core-shared-services-deployment.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
   workflow_run:
     workflows: ["Terraform: New environment"]
     types: [completed]
@@ -43,5 +45,5 @@ jobs:
       working-directory: "terraform/environments/core-shared-services"
       environment: production
     secrets:
-      modernisation_platform_environments: "${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}"
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
\ No newline at end of file
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
\ No newline at end of file
diff --git a/.github/workflows/core-vpc-development-deployment.yml b/.github/workflows/core-vpc-development-deployment.yml
index ee3fa80e2..ed9124d86 100644
--- a/.github/workflows/core-vpc-development-deployment.yml
+++ b/.github/workflows/core-vpc-development-deployment.yml
@@ -19,6 +19,7 @@ on:
       - 'terraform/modules/vpc-nacls/**'
       - 'terraform/modules/ram-resource-share/**'
       - 'terraform/modules/core-vpc-tgw-routes/**'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
       - '!**.md'
   pull_request:
     branches:
@@ -37,6 +38,7 @@ on:
       - 'terraform/modules/vpc-nacls/**'
       - 'terraform/modules/ram-resource-share/**'
       - 'terraform/modules/core-vpc-tgw-routes/**'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
       - '!**.md'
   workflow_dispatch:
 
@@ -60,8 +62,8 @@ jobs:
       working-directory: "terraform/environments/core-vpc"
       environment: development
     secrets:
-      modernisation_platform_environments: "${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}"
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
 
   member-account-ram-association:
     runs-on: [ ubuntu-latest ]
diff --git a/.github/workflows/core-vpc-preproduction-deployment.yml b/.github/workflows/core-vpc-preproduction-deployment.yml
index bab20ccd8..026b61842 100644
--- a/.github/workflows/core-vpc-preproduction-deployment.yml
+++ b/.github/workflows/core-vpc-preproduction-deployment.yml
@@ -19,6 +19,7 @@ on:
       - 'terraform/modules/vpc-nacls/**'
       - 'terraform/modules/ram-resource-share/**'
       - 'terraform/modules/core-vpc-tgw-routes/**'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
       - '!**.md'
   pull_request:
     branches:
@@ -37,6 +38,7 @@ on:
       - 'terraform/modules/vpc-nacls/**'
       - 'terraform/modules/ram-resource-share/**'
       - 'terraform/modules/core-vpc-tgw-routes/**'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
       - '!**.md'
   workflow_dispatch:
 
@@ -59,8 +61,8 @@ jobs:
       working-directory: "terraform/environments/core-vpc"
       environment: preproduction
     secrets:
-      modernisation_platform_environments: "${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}"
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
 
   member-account-ram-association:
     runs-on: [ ubuntu-latest ]
diff --git a/.github/workflows/core-vpc-production-deployment.yml b/.github/workflows/core-vpc-production-deployment.yml
index b5252c8c8..874e145ab 100644
--- a/.github/workflows/core-vpc-production-deployment.yml
+++ b/.github/workflows/core-vpc-production-deployment.yml
@@ -19,6 +19,7 @@ on:
       - 'terraform/modules/vpc-nacls/**'
       - 'terraform/modules/ram-resource-share/**'
       - 'terraform/modules/core-vpc-tgw-routes/**'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
       - '!**.md'
   pull_request:
     branches:
@@ -37,6 +38,7 @@ on:
       - 'terraform/modules/vpc-nacls/**'
       - 'terraform/modules/ram-resource-share/**'
       - 'terraform/modules/core-vpc-tgw-routes/**'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
       - '!**.md'
   workflow_dispatch:
 
@@ -59,8 +61,8 @@ jobs:
       working-directory: "terraform/environments/core-vpc"
       environment: production
     secrets:
-      modernisation_platform_environments: "${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}"
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
 
   member-account-ram-association:
     runs-on: [ ubuntu-latest ]
diff --git a/.github/workflows/core-vpc-test-deployment.yml b/.github/workflows/core-vpc-test-deployment.yml
index 3dad441e2..e1786a43f 100644
--- a/.github/workflows/core-vpc-test-deployment.yml
+++ b/.github/workflows/core-vpc-test-deployment.yml
@@ -59,8 +59,8 @@ jobs:
       working-directory: "terraform/environments/core-vpc"
       environment: test
     secrets:
-      modernisation_platform_environments: "${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}"
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+        MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+        PASSPHRASE: ${{ secrets.PASSPHRASE }}
 
   member-account-ram-association:
     runs-on: [ ubuntu-latest ]
diff --git a/.github/workflows/modernisation-platform-account.yml b/.github/workflows/modernisation-platform-account.yml
index 0908397af..166f60745 100644
--- a/.github/workflows/modernisation-platform-account.yml
+++ b/.github/workflows/modernisation-platform-account.yml
@@ -7,6 +7,7 @@ on:
       - '!**.md'
       - '.github/workflows/modernisation-platform-account.yml'
       - 'collaborators.json'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
     branches:
       - main
   pull_request:
@@ -15,6 +16,7 @@ on:
       - '!**.md'
       - '.github/workflows/modernisation-platform-account.yml'
       - 'collaborators.json'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
     branches:
       - main
     types: [opened, edited, reopened, synchronize]
@@ -35,5 +37,5 @@ jobs:
       working-directory: "terraform/modernisation-platform-account"
       workflow_id: "modernisation-platform-account"
     secrets:
-      modernisation_platform_environments: ${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+        MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+        PASSPHRASE: ${{ secrets.PASSPHRASE }}
diff --git a/.github/workflows/reusable_terraform_plan_apply.yml b/.github/workflows/reusable_terraform_plan_apply.yml
index 0e84afbbf..2a02064a3 100644
--- a/.github/workflows/reusable_terraform_plan_apply.yml
+++ b/.github/workflows/reusable_terraform_plan_apply.yml
@@ -51,6 +51,9 @@ jobs:
         with:
           environment_management: ${{ needs.retrieve-secrets.outputs.environment_management }}
           slack_webhook_url: ${{ needs.retrieve-secrets.outputs.slack_webhook_url }}
+          pagerduty_token: ${{ needs.retrieve-secrets.outputs.pagerduty_token }}
+          pagerduty_userapi_token: ${{ needs.retrieve-secrets.outputs.pagerduty_userapi_token }}
+          terraform_github_token: ${{ needs.retrieve-secrets.outputs.terraform_github_token }}
           PASSPHRASE: ${{ secrets.PASSPHRASE }}
 
       - name: Set up variables
diff --git a/.github/workflows/terraform-github.yml b/.github/workflows/terraform-github.yml
index 6eb5e6470..a577ad1c4 100644
--- a/.github/workflows/terraform-github.yml
+++ b/.github/workflows/terraform-github.yml
@@ -41,9 +41,8 @@ jobs:
       working-directory: "terraform/github"
       workflow_id: "github"
     secrets:
-      modernisation_platform_environments: ${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}
-      gh_workflow_token: ${{ secrets.TERRAFORM_GITHUB_TOKEN }}
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
 
   create-github-environments:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/terraform-pagerduty.yml b/.github/workflows/terraform-pagerduty.yml
index 832c3f768..0446e3867 100644
--- a/.github/workflows/terraform-pagerduty.yml
+++ b/.github/workflows/terraform-pagerduty.yml
@@ -6,6 +6,7 @@ on:
       - 'terraform/pagerduty/**'
       - '!**.md'
       - '.github/workflows/terraform-pagerduty.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
     branches:
       - main
   pull_request:
@@ -13,6 +14,7 @@ on:
       - 'terraform/pagerduty/**'
       - '!**.md'
       - '.github/workflows/terraform-pagerduty.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
     branches:
       - main
     types: [opened, edited, reopened, synchronize]
@@ -33,7 +35,5 @@ jobs:
       working-directory: "terraform/pagerduty"
       workflow_id: "pagerduty"
     secrets:
-      modernisation_platform_environments: ${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}
-      pagerduty_token: ${{ secrets.PAGERDUTY_TOKEN }}
-      pagerduty_userapi_token: ${{ secrets.PAGERDUTY_USERAPI_TOKEN}}
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
\ No newline at end of file
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
\ No newline at end of file
diff --git a/.github/workflows/terraform-single-sign-on.yml b/.github/workflows/terraform-single-sign-on.yml
index b0dc320bc..9fcfc3d8c 100644
--- a/.github/workflows/terraform-single-sign-on.yml
+++ b/.github/workflows/terraform-single-sign-on.yml
@@ -6,6 +6,7 @@ on:
       - 'terraform/single-sign-on/**'
       - '!**.md'
       - '.github/workflows/terraform-single-sign-on.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
     branches:
       - main
   pull_request:
@@ -13,6 +14,7 @@ on:
       - 'terraform/single-sign-on/**'
       - '!**.md'
       - '.github/workflows/terraform-single-sign-on.yml'
+      - '.github/workflows/reusable_terraform_plan_apply.yml'
     branches:
       - main
     types: [opened, edited, reopened, synchronize]
@@ -33,5 +35,5 @@ jobs:
       working-directory: "terraform/single-sign-on"
       workflow_id: "single-sign-on"
     secrets:
-      modernisation_platform_environments: ${{ secrets.MODERNISATION_PLATFORM_ENVIRONMENTS }}
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
\ No newline at end of file
+      MODERNISATION_PLATFORM_ACCOUNT_NUMBER: "${{ secrets.MODERNISATION_PLATFORM_ACCOUNT_NUMBER }}"
+      PASSPHRASE: ${{ secrets.PASSPHRASE }}
\ No newline at end of file