diff --git a/app/assets/javascripts/govuk_publishing_components/analytics-ga4/pii-remover.js b/app/assets/javascripts/govuk_publishing_components/analytics-ga4/pii-remover.js
index 65c12167ba..cbb55d4b60 100644
--- a/app/assets/javascripts/govuk_publishing_components/analytics-ga4/pii-remover.js
+++ b/app/assets/javascripts/govuk_publishing_components/analytics-ga4/pii-remover.js
@@ -27,6 +27,10 @@
   var UNLOCK_TOKEN_PATTERN = /unlock_token=[a-zA-Z0-9-]+/g
   var STATE_PATTERN = /state=.[^&]+/g
 
+  // prevent visa application IDs from being tracked, as some mistakenly use GOV.UK. to search for these.
+  var VISA_PATTERN_GWF = /GWF\d{9}/g
+  var VISA_PATTERN_GB = /GB\d{12}/g
+
   function shouldStripDates () {
     var metas = document.querySelectorAll('meta[name="govuk:ga4-strip-dates"]')
     return metas.length > 0
@@ -97,6 +101,8 @@
     stripped = stripped.replace(RESET_PASSWORD_TOKEN_PATTERN, 'reset_password_token=[reset_password_token]')
     stripped = stripped.replace(UNLOCK_TOKEN_PATTERN, 'unlock_token=[unlock_token]')
     stripped = stripped.replace(STATE_PATTERN, 'state=[state]')
+    stripped = stripped.replace(VISA_PATTERN_GWF, '[gwf number]')
+    stripped = stripped.replace(VISA_PATTERN_GB, '[gb eori number]')
     stripped = this.stripQueryStringParameters(stripped)
 
     if (this.stripDatePII === true) {
diff --git a/spec/javascripts/govuk_publishing_components/analytics-ga4/pii-remover.spec.js b/spec/javascripts/govuk_publishing_components/analytics-ga4/pii-remover.spec.js
index e8edf59601..99d866b844 100644
--- a/spec/javascripts/govuk_publishing_components/analytics-ga4/pii-remover.spec.js
+++ b/spec/javascripts/govuk_publishing_components/analytics-ga4/pii-remover.spec.js
@@ -55,6 +55,11 @@ describe('GOVUK.analyticsGa4.PIIRemover', function () {
       arr = pii.stripPII(arr)
       expect(arr).toEqual(strippedArr)
     })
+
+    it('strips visa application numbers', function () {
+      var string = pii.stripPII('my visa application numbers are GWF123456789 and GB123456789000')
+      expect(string).toEqual('my visa application numbers are [gwf number] and [gb eori number]')
+    })
   })
 
   describe('by default for account specific PII', function () {