diff --git a/dotcom-rendering/src/components/ReaderRevenueDev.importable.tsx b/dotcom-rendering/src/components/ReaderRevenueDev.importable.tsx
index f5cf94bb4cf..c4d22ea90ce 100644
--- a/dotcom-rendering/src/components/ReaderRevenueDev.importable.tsx
+++ b/dotcom-rendering/src/components/ReaderRevenueDev.importable.tsx
@@ -9,7 +9,9 @@ export const ReaderRevenueDev = ({ shouldHideReaderRevenue }: Props) => {
 	useEffect(() => {
 		// Used internally only, so only import each function on demand
 		const loadAndRun =
-			<K extends keyof ReaderRevenueDevUtils>(key: K) =>
+			<K extends keyof Omit<ReaderRevenueDevUtils, 'bannerToShow'>>(
+				key: K,
+			) =>
 			(asExistingSupporter: boolean) =>
 				import(
 					/* webpackChunkName: "readerRevenueDevUtils" */ '../lib/readerRevenueDevUtils'
@@ -36,6 +38,7 @@ export const ReaderRevenueDev = ({ shouldHideReaderRevenue }: Props) => {
 				showMeTheBanner: loadAndRun('showMeTheBanner'),
 				showNextVariant: loadAndRun('showNextVariant'),
 				showPreviousVariant: loadAndRun('showPreviousVariant'),
+				bannerToShow: undefined,
 			};
 		}
 	}, [shouldHideReaderRevenue]);
diff --git a/dotcom-rendering/src/components/StickyBottomBanner.importable.tsx b/dotcom-rendering/src/components/StickyBottomBanner.importable.tsx
index 3ae188ee1eb..067844d98ea 100644
--- a/dotcom-rendering/src/components/StickyBottomBanner.importable.tsx
+++ b/dotcom-rendering/src/components/StickyBottomBanner.importable.tsx
@@ -3,7 +3,7 @@ import type {
 	BrazeMessagesInterface,
 } from '@guardian/braze-components/logic';
 import type { CountryCode } from '@guardian/libs';
-import { cmp, isString, isUndefined, storage } from '@guardian/libs';
+import { cmp, isString, isUndefined, log, storage } from '@guardian/libs';
 import type { ModuleData } from '@guardian/support-dotcom-components/dist/dotcom/types';
 import type { BannerProps } from '@guardian/support-dotcom-components/dist/shared/types';
 import { useEffect, useState } from 'react';
@@ -72,6 +72,8 @@ const buildCmpBannerConfig = (): CandidateConfig<void> => ({
 					result ? { show: true, meta: undefined } : { show: false },
 				),
 		show: () => {
+			log('supporterRevenue', `Showing CMP UI`);
+			window.guardian.readerRevenue.bannerToShow = 'cmpUi';
 			// New CMP is not a react component and is shown outside of react's world
 			// so render nothing if it will show
 			return null;
@@ -160,9 +162,11 @@ const buildRRBannerConfigWith = ({
 						ophanPageViewId,
 						pageId,
 					}),
-				show:
-					({ name, props }: ModuleData<BannerProps>) =>
-					() => <BannerComponent name={name} props={props} />,
+				show: ({ name, props }: ModuleData<BannerProps>) => {
+					log('supporterRevenue', `Showing banner: ${name}`);
+					window.guardian.readerRevenue.bannerToShow = name;
+					return () => <BannerComponent name={name} props={props} />;
+				},
 			},
 			timeoutMillis: DEFAULT_BANNER_TIMEOUT_MILLIS,
 		};
@@ -193,9 +197,11 @@ const buildBrazeBanner = (
 				tags,
 				shouldHideReaderRevenue,
 			),
-		show: (meta: any) => () => (
-			<BrazeBanner meta={meta} idApiUrl={idApiUrl} />
-		),
+		show: (meta: any) => () => {
+			log('supporterRevenue', `Showing banner: braze-banner`);
+			window.guardian.readerRevenue.bannerToShow = 'braze-banner';
+			return <BrazeBanner meta={meta} idApiUrl={idApiUrl} />;
+		},
 	},
 	timeoutMillis: DEFAULT_BANNER_TIMEOUT_MILLIS,
 });
@@ -304,9 +310,9 @@ export const StickyBottomBanner = ({
 		};
 
 		pickMessage(bannerConfig, renderingTarget)
-			.then((PickedBanner: () => MaybeFC) =>
-				setSelectedBanner(PickedBanner),
-			)
+			.then((PickedBanner: () => MaybeFC) => {
+				setSelectedBanner(PickedBanner);
+			})
 			.catch((e) =>
 				console.error(
 					`StickyBottomBanner pickMessage - error: ${String(e)}`,
diff --git a/dotcom-rendering/src/lib/messagePicker.ts b/dotcom-rendering/src/lib/messagePicker.ts
index f07ff1fd4a5..55cbd6fd075 100644
--- a/dotcom-rendering/src/lib/messagePicker.ts
+++ b/dotcom-rendering/src/lib/messagePicker.ts
@@ -1,4 +1,4 @@
-import { isUndefined, startPerformanceMeasure } from '@guardian/libs';
+import { isUndefined, log, startPerformanceMeasure } from '@guardian/libs';
 import { getOphan } from '../client/ophan/ophan';
 import type { RenderingTarget } from '../types/renderingTarget';
 
@@ -164,6 +164,22 @@ export const pickMessage = (
 			.then((winner) => {
 				clearAllTimeouts(candidateConfigsWithTimeout);
 
+				log(
+					'supporterRevenue',
+					`pickMessage for ${name}: ${JSON.stringify(winner)}}`,
+				);
+				document.dispatchEvent(
+					new CustomEvent<{
+						type: string;
+						winner: string | null;
+					}>('supporterRevenue:messagePicker', {
+						detail: {
+							type: name,
+							winner: winner?.candidate.id ?? null,
+						},
+					}),
+				);
+
 				if (winner === null) {
 					resolve(defaultShow);
 				} else {
diff --git a/dotcom-rendering/src/lib/readerRevenueDevUtils.ts b/dotcom-rendering/src/lib/readerRevenueDevUtils.ts
index aab225ee3de..a7676c7a9cd 100644
--- a/dotcom-rendering/src/lib/readerRevenueDevUtils.ts
+++ b/dotcom-rendering/src/lib/readerRevenueDevUtils.ts
@@ -161,6 +161,7 @@ export interface ReaderRevenueDevUtils {
 	showMeTheBanner: ReaderRevenueDevUtil;
 	showNextVariant: ReaderRevenueDevUtil;
 	showPreviousVariant: ReaderRevenueDevUtil;
+	bannerToShow?: string;
 }
 
 const getForcedVariant = (type: 'epic' | 'banner'): string | null => {