diff --git a/ansible/ecr-lifecycle/ecr_lifecycle.json b/ansible/ecr-lifecycle/ecr_lifecycle.json
new file mode 100644
index 000000000..cfdea1bdf
--- /dev/null
+++ b/ansible/ecr-lifecycle/ecr_lifecycle.json
@@ -0,0 +1,36 @@
+{
+  "rules": [
+    {
+      "rulePriority": 1,
+      "description": "Keep the 10 most recent ECS deployment images - AMEND NUMBER AFTER TEST",
+      "selection": {
+        "tagStatus": "tagged",
+        "tagPrefixList": ["ecs-"],
+        "countType": "imageCountMoreThan",
+        "countNumber": 800
+      },
+      "action": { "type": "expire" }
+    },
+    {
+      "rulePriority": 2,
+      "description": "Never expire the 'latest' tag",
+      "selection": {
+        "tagStatus": "tagged",
+        "tagPrefixList": ["latest"],
+        "countType": "imageCountMoreThan",
+        "countNumber": 9999
+      },
+      "action": { "type": "expire" }
+    },
+    {
+      "rulePriority": 3,
+      "description": "Keep the 5 most recent build images (all tags) - AMEND NUMBER AFTER TEST",
+      "selection": {
+        "tagStatus": "any",
+        "countType": "imageCountMoreThan",
+        "countNumber": 800
+      },
+      "action": { "type": "expire" }
+    }
+  ]
+}
diff --git a/ansible/roles/build-ecs-proxies/tasks/build-container.yml b/ansible/roles/build-ecs-proxies/tasks/build-container.yml
index 56be84bb0..7e90e04f7 100644
--- a/ansible/roles/build-ecs-proxies/tasks/build-container.yml
+++ b/ansible/roles/build-ecs-proxies/tasks/build-container.yml
@@ -31,3 +31,53 @@
   ansible.builtin.command:
     cmd: "docker push {{ image_name }}"
   when: build_result.rc == 0
+
+- name: Get existing lifecycle policy JSON for {{ service_id }}_{{ item }}
+  ansible.builtin.command: >
+    {{ aws_cmd }} ecr get-lifecycle-policy
+    --repository-name {{ service_id }}_{{ item }}
+    --query 'lifecyclePolicyText'
+    --output text
+  register: existing_policy_raw
+  failed_when: false
+  changed_when: false
+
+- name: Parse existing lifecycle policy JSON if present
+  set_fact:
+    existing_policy_json: "{{ existing_policy_raw.stdout | from_json }}"
+  when:
+    - existing_policy_raw.stdout is defined
+    - existing_policy_raw.stdout != ""
+    - existing_policy_raw.stdout != "None"
+    - existing_policy_raw.stdout != "null"
+
+- name: Ensure existing_policy_json always exists
+  set_fact:
+    existing_policy_json: {}
+  when: existing_policy_json is not defined
+
+- name: Read lifecycle policy from the shared file
+  ansible.builtin.slurp:
+    src: "{{ playbook_dir }}/ecr-lifecycle/ecr_lifecycle.json"
+  register: desired_policy_raw
+
+- name: Debug raw slurp output
+  debug:
+    var: desired_policy_raw
+
+- name: Show decoded lifecycle policy content
+  debug:
+    msg: "{{ desired_policy_raw.content | b64decode }}"
+
+- name: Decode lifecycle policy file
+  set_fact:
+    desired_policy_json: "{{ desired_policy_raw.content | b64decode | from_json }}"
+
+- name: Apply lifecycle policy to ecr {{ service_id }}_{{ item }} if different
+  ansible.builtin.command: >
+    {{ aws_cmd }} ecr put-lifecycle-policy
+    --repository-name {{ service_id }}_{{ item }}
+    --lifecycle-policy-text '{{ desired_policy_json | to_json }}'
+  when:
+    - existing_policy_json != desired_policy_json
+
diff --git a/ansible/roles/create-api-deployment-pre-reqs/templates/terraform/iam.tf b/ansible/roles/create-api-deployment-pre-reqs/templates/terraform/iam.tf
index 29eb55a3e..775b01a11 100644
--- a/ansible/roles/create-api-deployment-pre-reqs/templates/terraform/iam.tf
+++ b/ansible/roles/create-api-deployment-pre-reqs/templates/terraform/iam.tf
@@ -69,6 +69,8 @@ data "aws_iam_policy_document" "ecs-execution-role" {
       "ecr:DescribeRepositories",
       "ecr:ListImages",
       "ecr:DescribeImages",
+      "ecr:GetLifecyclePolicy",
+      "ecr:PutLifecyclePolicy",
       "s3:GetObject"
     ]
 
@@ -173,6 +175,18 @@ data "aws_iam_policy_document" "deploy-user" {
 
   }
 
+  statement {
+    actions = [
+      "ecr:GetLifecyclePolicy",
+      "ecr:PutLifecyclePolicy"
+    ]
+
+    resources = [
+      "arn:aws:ecr:${local.region}:${local.account_id}:repository/${var.service_id}",
+      "arn:aws:ecr:${local.region}:${local.account_id}:repository/${var.service_id}_*"
+    ]
+  }
+
   statement {
     actions = [
       "s3:ListBucket",
diff --git a/ansible/roles/create-ecr-build-role/vars/main.yml b/ansible/roles/create-ecr-build-role/vars/main.yml
index c40db5b1a..817fd7bb0 100644
--- a/ansible/roles/create-ecr-build-role/vars/main.yml
+++ b/ansible/roles/create-ecr-build-role/vars/main.yml
@@ -44,6 +44,7 @@ aws_ecs_policy:
         - "ecr:StartImageScan"
         - "ecr:StartLifecyclePolicyPreview"
         - "ecr:UploadLayerPart"
+        - "ecr:PutLifecyclePolicy"
       Resource: [
         "arn:aws:ecr:{{ aws_region }}:{{ aws_account_id }}:repository/{{ service_id }}_*"
       ]
diff --git a/ansible/roles/deploy-ecs-proxies/tasks/main.yml b/ansible/roles/deploy-ecs-proxies/tasks/main.yml
index 668c8cb0e..f70aa3456 100644
--- a/ansible/roles/deploy-ecs-proxies/tasks/main.yml
+++ b/ansible/roles/deploy-ecs-proxies/tasks/main.yml
@@ -82,6 +82,30 @@
       register: tfapply
       when: not do_not_terraform
 
+    - name: Retag and promote ECS image (release pipelines only)
+      when: pr_number is not defined or pr_number == ""
+      vars:
+        PTL_REG: "{{ PTL_ACCOUNT_ID }}.dkr.ecr.eu-west-2.amazonaws.com"
+        PROD_REG: "{{ PROD_ACCOUNT_ID }}.dkr.ecr.eu-west-2.amazonaws.com"
+        IMG: "{{ service_id }}_{{ ecs_service[0].name }}"
+        TAG: "{{ build_label }}"
+        NEW: "ecs-{{ build_label }}"
+      shell: |
+        aws ecr get-login-password --region eu-west-2 \
+          | docker login --username AWS --password-stdin {{ PTL_REG }}
+
+        docker pull {{ PTL_REG }}/{{ IMG }}:{{ TAG }}
+        docker tag {{ PTL_REG }}/{{ IMG }}:{{ TAG }} {{ PTL_REG }}/{{ IMG }}:{{ NEW }}
+        docker push {{ PTL_REG }}/{{ IMG }}:{{ NEW }}
+
+        aws ecr get-login-password --region eu-west-2 \
+          | docker login --username AWS --password-stdin {{ PROD_REG }}
+
+        docker tag {{ PTL_REG }}/{{ IMG }}:{{ NEW }} {{ PROD_REG }}/{{ IMG }}:{{ NEW }}
+        docker push {{ PROD_REG }}/{{ IMG }}:{{ NEW }}
+      args:
+        executable: /bin/bash
+
   rescue:
     - name: output plan
       debug:
diff --git a/ansible/roles/deploy-ecs-proxies/templates/terraform/locals.tf b/ansible/roles/deploy-ecs-proxies/templates/terraform/locals.tf
index c01c869d5..9556883d4 100644
--- a/ansible/roles/deploy-ecs-proxies/templates/terraform/locals.tf
+++ b/ansible/roles/deploy-ecs-proxies/templates/terraform/locals.tf
@@ -49,7 +49,7 @@ locals {
         (
           container
           | combine(
-            {'image': '${local.account_id}.dkr.ecr.eu-west-2.amazonaws.com/' + service_id + '_' + container.name + ':' + build_label }
+            {'image': '${local.account_id}.dkr.ecr.eu-west-2.amazonaws.com/' + service_id + '_' + container.name + ':ecs-' + build_label }
           )
         ) | to_json
     }},