diff --git a/src/app/api/proxy/map/route.ts b/src/app/api/proxy/map/route.ts
index 6eebf4f5b..b8001b827 100644
--- a/src/app/api/proxy/map/route.ts
+++ b/src/app/api/proxy/map/route.ts
@@ -1,38 +1,70 @@
 import assert from 'assert'
-import { NextResponse } from 'next/server'
+import { NextRequest, NextResponse } from 'next/server'
 import { z } from 'zod'
 
-export const dynamic = 'force-dynamic'
+import { MapTileProvider } from '@/app/types'
 
-// TODO: Update infra env vars to use generic naming.
-const clientUrl = process.env.ESRI_CLIENT_URL
-const clientId = process.env.ESRI_CLIENT_KEY
-const clientSecret = process.env.ESRI_CLIENT_SECRET
+export const dynamic = 'force-dynamic'
 
-const clientResponseSchema = z.object({
+const osmClientResponseSchema = z.object({
   access_token: z.string(),
   expires_in: z.string(),
   issued_at: z.string(),
   token_type: z.string(),
 })
 
-export async function POST() {
+const esriClientResponseSchema = z.object({
+  access_token: z.string(),
+  expires_in: z.coerce.string(),
+})
+
+export async function POST(request: NextRequest) {
+  const body = await request.json()
+
+  let clientUrl
+  let clientId
+  let clientSecret
+
+  const provider: MapTileProvider = body.provider
+
+  if (provider === 'ArcGISEsri') {
+    clientUrl = process.env.ESRI_CLIENT_URL
+    clientId = process.env.ESRI_CLIENT_KEY
+    clientSecret = process.env.ESRI_CLIENT_SECRET
+  }
+
+  if (provider === 'OrdinanceSurveyMaps') {
+    clientUrl = process.env.OSM_CLIENT_URL
+    clientId = process.env.OSM_CLIENT_KEY
+    clientSecret = process.env.OSM_CLIENT_SECRET
+  }
+
   assert(clientUrl)
   assert(clientId)
   assert(clientSecret)
 
-  const basicAuth = btoa(`${clientId}:${clientSecret}`)
+  const osmBasicAuth = { Authorization: `Basic ${btoa(`${clientId}:${clientSecret}`)}` }
+  const esriAuth = { client_id: clientId, client_secret: clientSecret }
 
   const req = await fetch(clientUrl, {
     method: 'POST',
-    headers: { Authorization: `Basic ${basicAuth}`, 'Content-Type': 'application/x-www-form-urlencoded' },
+    headers: {
+      'Content-Type': 'application/x-www-form-urlencoded',
+      ...(provider === 'OrdinanceSurveyMaps' && osmBasicAuth),
+    },
     body: new URLSearchParams({
+      ...(provider === 'ArcGISEsri' && esriAuth),
       grant_type: 'client_credentials',
+      expiration: '5',
     }),
   })
 
   const json = await req.json()
-  const { access_token: token, expires_in: expiresIn } = clientResponseSchema.parse(json)
+
+  console.log('json', json)
+  const parser = provider === 'ArcGISEsri' ? esriClientResponseSchema : osmClientResponseSchema
+
+  const { access_token: token, expires_in: expiresIn } = parser.parse(json)
 
   return NextResponse.json({
     token,
diff --git a/src/app/components/ui/ukhsa/Map/health-alerts/HealthAlertsMapDialog.tsx b/src/app/components/ui/ukhsa/Map/health-alerts/HealthAlertsMapDialog.tsx
index 8774bd4e4..76b28d5d0 100644
--- a/src/app/components/ui/ukhsa/Map/health-alerts/HealthAlertsMapDialog.tsx
+++ b/src/app/components/ui/ukhsa/Map/health-alerts/HealthAlertsMapDialog.tsx
@@ -22,7 +22,7 @@ import useWeatherHealthAlertList from '@/app/hooks/queries/useWeatherHealthAlert
 import { useTranslation } from '@/app/i18n/client'
 import { MapTileProvider } from '@/app/types'
 
-const { Map, BaseLayer, BaseLayerOSM, ChoroplethLayer, HealthAlertControl } = {
+const { Map, BaseLayer, BaseLayerOSM, BaseLayerEsri, ChoroplethLayer, HealthAlertControl } = {
   Map: dynamic(() => import('@/app/components/ui/ukhsa/Map/Map'), {
     ssr: false,
     loading: () => <Skeleton className="h-screen" />,
@@ -33,6 +33,9 @@ const { Map, BaseLayer, BaseLayerOSM, ChoroplethLayer, HealthAlertControl } = {
   BaseLayerOSM: dynamic(() => import('@/app/components/ui/ukhsa/Map/shared/layers/BaseLayerOSM'), {
     ssr: false,
   }),
+  BaseLayerEsri: dynamic(() => import('@/app/components/ui/ukhsa/Map/shared/layers/BaseLayerEsri'), {
+    ssr: false,
+  }),
   ChoroplethLayer: dynamic(() => import('@/app/components/ui/ukhsa/Map/shared/layers/ChoroplethLayer'), {
     ssr: false,
   }),
@@ -62,8 +65,12 @@ export default function HealthAlertsMapDialog({ featureCollection, mapTileProvid
   const alertsQuery = useWeatherHealthAlertList({ type })
 
   const baseLayer = useMemo(() => {
+    console.log('mapTileProvider', mapTileProvider)
     if (mapTileProvider === 'OrdinanceSurveyMaps') {
-      return <BaseLayerOSM />
+      return <BaseLayerOSM provider={mapTileProvider} />
+    }
+    if (mapTileProvider === 'ArcGISEsri') {
+      return <BaseLayerEsri provider={mapTileProvider} />
     }
     return <BaseLayer />
   }, [mapTileProvider])
diff --git a/src/app/components/ui/ukhsa/Map/health-alerts/HealthAlertsMapWrapper.tsx b/src/app/components/ui/ukhsa/Map/health-alerts/HealthAlertsMapWrapper.tsx
index 0f4193fc2..92814546e 100644
--- a/src/app/components/ui/ukhsa/Map/health-alerts/HealthAlertsMapWrapper.tsx
+++ b/src/app/components/ui/ukhsa/Map/health-alerts/HealthAlertsMapWrapper.tsx
@@ -20,6 +20,8 @@ export async function HealthAlertsMapWrapper() {
       <Suspense fallback={null}>
         {mapTileProvider === 'OrdinanceSurveyMaps' ? (
           <HealthAlertsMapDialog mapTileProvider="OrdinanceSurveyMaps" featureCollection={featureCollection} />
+        ) : mapTileProvider === 'ArcGISEsri' ? (
+          <HealthAlertsMapDialog mapTileProvider="ArcGISEsri" featureCollection={featureCollection} />
         ) : (
           <HealthAlertsMapDialog mapTileProvider="OpenStreetMaps" featureCollection={featureCollection} />
         )}
diff --git a/src/app/components/ui/ukhsa/Map/shared/layers/BaseLayerEsri.tsx b/src/app/components/ui/ukhsa/Map/shared/layers/BaseLayerEsri.tsx
index e1e01ab01..c03c16515 100644
--- a/src/app/components/ui/ukhsa/Map/shared/layers/BaseLayerEsri.tsx
+++ b/src/app/components/ui/ukhsa/Map/shared/layers/BaseLayerEsri.tsx
@@ -9,6 +9,7 @@ import { ComponentProps } from 'react'
 import VectorBasemapLayer from 'react-esri-leaflet/plugins/VectorBasemapLayer'
 
 import useMapAuthToken from '@/app/hooks/queries/useMapAuthToken'
+import { MapTileProvider } from '@/app/types'
 
 import { useBaseLayerEsri } from '../hooks/useBaseLayerEsri'
 
@@ -16,13 +17,14 @@ type EsriProps = ComponentProps<typeof VectorBasemapLayer>
 
 interface BaseLayerEsriProps extends Omit<EsriProps, 'name'> {
   name?: EsriProps['name']
+  provider: MapTileProvider
 }
 
-const BaseLayerEsri = ({ name = 'ArcGIS:Navigation', ...rest }: BaseLayerEsriProps) => {
+const BaseLayerEsri = ({ name = 'ArcGIS:Navigation', provider, ...rest }: BaseLayerEsriProps) => {
   useBaseLayerEsri()
   const {
     data: { token },
-  } = useMapAuthToken()
+  } = useMapAuthToken(provider)
   if (!token) return null
   return (
     <VectorBasemapLayer
diff --git a/src/app/components/ui/ukhsa/Map/shared/layers/BaseLayerOSM.tsx b/src/app/components/ui/ukhsa/Map/shared/layers/BaseLayerOSM.tsx
index ce0372cb3..7e61f1fd9 100644
--- a/src/app/components/ui/ukhsa/Map/shared/layers/BaseLayerOSM.tsx
+++ b/src/app/components/ui/ukhsa/Map/shared/layers/BaseLayerOSM.tsx
@@ -10,6 +10,7 @@ import VectorTileLayer from 'react-leaflet-vector-tile-layer'
 
 import { ordinanceSurveyMapsLicense } from '@/app/constants/map.constants'
 import useMapAuthToken from '@/app/hooks/queries/useMapAuthToken'
+import { MapTileProvider } from '@/app/types'
 
 // The `transformRequest` method must be augmented as the `TileLayer` component is missing a type for this prop
 declare module 'react-leaflet-vector-tile-layer' {
@@ -24,17 +25,19 @@ declare module 'react-leaflet-vector-tile-layer' {
   }
 }
 
-interface BaseLayerProps extends Partial<TileLayerProps> {}
+interface BaseLayerProps extends Partial<TileLayerProps> {
+  provider: MapTileProvider
+}
 
 const attribution = `\n\n© Crown copyright ${new Date().getFullYear()} OS ${ordinanceSurveyMapsLicense}. Use of this data is subject to terms and conditions.\n
 You are granted a non-exclusive, royalty free revocable licence solely to view the licensed data for non-commercial purposes for the period during which UKHSA makes it available; You are not permitted to copy, sub-license, distribute, sell or otherwise make available the licensed data to third parties in any form; and Third party rights to enforce the terms of this licence shall be reserved to OS.\n
 Ⓗ Hawlfraint y Goron ${new Date().getFullYear()} Arolwg Ordnans ${ordinanceSurveyMapsLicense}. Defnyddio data hwn yn amodol ar delerau ac amodau.\nRhoddir trwydded ddirymiadwy, anghyfyngedig a heb freindal i chi i weld y data trwyddedig at ddibenion anfasnachol am y cyfnod y mae ar gael gan UKHSA. Ni chewch gopïo, is-drwyddedu, dosbarthu na gwerthu unrhyw ran o’r data hwn i drydydd partïon mewn unrhyw ffurf; ac. Yr Arolwg Ordnans fydd yn cadw’r hawlio trydydd parti i orfodi amodau’r drwydded hon.
 `
 
-const BaseLayerOSM = ({ ...rest }: BaseLayerProps) => {
+const BaseLayerOSM = ({ provider, ...rest }: BaseLayerProps) => {
   const {
     data: { token },
-  } = useMapAuthToken()
+  } = useMapAuthToken(provider)
   return (
     <VectorTileLayer
       {...rest}
diff --git a/src/app/hooks/queries/useMapAuthToken.ts b/src/app/hooks/queries/useMapAuthToken.ts
index 891e316cc..acb5114fa 100644
--- a/src/app/hooks/queries/useMapAuthToken.ts
+++ b/src/app/hooks/queries/useMapAuthToken.ts
@@ -1,23 +1,25 @@
 import { useQueryClient, useSuspenseQuery } from '@tanstack/react-query'
 import { z } from 'zod'
 
+import { MapTileProvider } from '@/app/types'
+
 const PROXY_ENDPOINT = 'api/proxy/map'
 const RETRY_ATTEMPTS = 1
 
 const proxyResponseSchema = z.object({ token: z.string(), expiresIn: z.string() })
 
-async function getToken() {
-  const req = await fetch(PROXY_ENDPOINT, { method: 'POST' })
+async function getToken(provider: MapTileProvider) {
+  const req = await fetch(PROXY_ENDPOINT, { method: 'POST', body: JSON.stringify({ provider }) })
   const res = await req.json()
   return proxyResponseSchema.parse(res)
 }
 
-export default function useMapAuthToken() {
+export default function useMapAuthToken(provider: MapTileProvider) {
   const queryClient = useQueryClient()
 
   return useSuspenseQuery({
     queryKey: ['weather-alert', 'map-auth-token'],
-    queryFn: getToken,
+    queryFn: async () => getToken(provider),
     retry: RETRY_ATTEMPTS,
     refetchInterval: (query) => {
       // Extract the token expiration time (in seconds) and set the query refetch interval