diff --git a/dotcom-rendering/cdk/bin/cdk.ts b/dotcom-rendering/cdk/bin/cdk.ts
index 9bc82cd7a17..51db54f2ddb 100644
--- a/dotcom-rendering/cdk/bin/cdk.ts
+++ b/dotcom-rendering/cdk/bin/cdk.ts
@@ -124,6 +124,12 @@ export const TagPageRenderingPropsCODE: RenderingCDKStackProps = {
 				scaleOutCooldown: Duration.seconds(60),
 			},
 		},
+
+		// Route all traffic to ECS
+		targetGroupWeights: {
+			ec2: 0,
+			ecs: 1,
+		},
 	},
 };
 
@@ -178,6 +184,12 @@ export const TagPageRenderingPropsPROD: RenderingCDKStackProps = {
 				scaleOutCooldown: Duration.seconds(60),
 			},
 		},
+
+		// Route 90% traffic to EC2, 10% to ECS
+		targetGroupWeights: {
+			ec2: 9,
+			ecs: 1,
+		},
 	},
 };
 
diff --git a/dotcom-rendering/cdk/lib/__snapshots__/renderingStack.test.ts.snap b/dotcom-rendering/cdk/lib/__snapshots__/renderingStack.test.ts.snap
index 12a9eecac0c..b4886f48dcb 100644
--- a/dotcom-rendering/cdk/lib/__snapshots__/renderingStack.test.ts.snap
+++ b/dotcom-rendering/cdk/lib/__snapshots__/renderingStack.test.ts.snap
@@ -2966,13 +2966,13 @@ exports[`The RenderingCDKStack matches the snapshot for Tag Page Rendering CODE
                   "TargetGroupArn": {
                     "Ref": "TargetGroupTagpagerendering42E428EE",
                   },
-                  "Weight": 1,
+                  "Weight": 0,
                 },
                 {
                   "TargetGroupArn": {
                     "Ref": "TagpagerenderingEcsTargetGroupTagpagerendering0976D2E5",
                   },
-                  "Weight": 0,
+                  "Weight": 1,
                 },
               ],
             },
@@ -5459,13 +5459,13 @@ exports[`The RenderingCDKStack matches the snapshot for Tag Page Rendering PROD
                   "TargetGroupArn": {
                     "Ref": "TargetGroupTagpagerendering42E428EE",
                   },
-                  "Weight": 1,
+                  "Weight": 9,
                 },
                 {
                   "TargetGroupArn": {
                     "Ref": "TagpagerenderingEcsTargetGroupTagpagerendering0976D2E5",
                   },
-                  "Weight": 0,
+                  "Weight": 1,
                 },
               ],
             },
diff --git a/dotcom-rendering/cdk/lib/renderingStack.ts b/dotcom-rendering/cdk/lib/renderingStack.ts
index 2acd6f517ca..596d184c6f6 100644
--- a/dotcom-rendering/cdk/lib/renderingStack.ts
+++ b/dotcom-rendering/cdk/lib/renderingStack.ts
@@ -72,6 +72,10 @@ export interface RenderingCDKStackProps extends Omit<GuStackProps, 'stack'> {
 		scaling: NonNullable<
 			GuLoadBalancedAppExperimentalProps['ecsProps']
 		>['scaling'];
+
+		targetGroupWeights: NonNullable<
+			GuLoadBalancedAppExperimentalProps['targetGroupWeights']
+		>;
 	};
 }
 
@@ -303,12 +307,7 @@ export class RenderingCDKStack extends CDKStack {
 							cpu: ecsProps.taskCpu,
 							scaling: ecsProps.scaling,
 						},
-
-						// Route all traffic to EC2
-						targetGroupWeights: {
-							ec2: 1,
-							ecs: 0,
-						},
+						targetGroupWeights: ecsProps.targetGroupWeights,
 					}),
 		});