diff --git a/app/assets/javascripts/analytics/init.js.erb b/app/assets/javascripts/analytics/init.js.erb
index ffeb5921d..06378a9b1 100644
--- a/app/assets/javascripts/analytics/init.js.erb
+++ b/app/assets/javascripts/analytics/init.js.erb
@@ -27,6 +27,7 @@
     var cookieDomain = (document.domain == 'www.gov.uk') ? '.www.gov.uk' : document.domain;
 
     var universalId = '<%= Rails.application.config.ga_universal_id %>';
+    var secondaryId = '<%= Rails.application.config.ga_secondary_id %>';
 
     // Configure profiles, setup custom vars, track initial pageview
     var analytics = new GOVUK.StaticAnalytics({
@@ -39,6 +40,8 @@
 
     // Make interface public for virtual pageviews and events
     GOVUK.analytics = analytics;
+    GOVUK.analytics.addLinkedTrackerDomain(secondaryId, 'www.gov.uk', 'gov.uk');
+    GOVUK.analytics.addLinkedTrackerDomain(secondaryId, 'designsystem', 'design-system.service.gov.uk');
   } else {
     GOVUK.analytics = dummyAnalytics
   }
diff --git a/config/application.rb b/config/application.rb
index 3fa9886d4..1614872c7 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -54,5 +54,6 @@ class Application < Rails::Application
 
     # Google Analytics ID
     config.ga_universal_id = ENV.fetch("GA_UNIVERSAL_ID", "UA-UNSET")
+    config.ga_secondary_id = ENV.fetch("GA_SECONDARY_ID", "UA-UNSET")
   end
 end
diff --git a/config/environments/production.rb b/config/environments/production.rb
index ded642019..32fe5bd7f 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -69,4 +69,5 @@
   config.eager_load = true
 
   config.ga_universal_id = ENV.fetch("GA_UNIVERSAL_ID", "UA-26179049-1")
+  config.ga_secondary_id = ENV.fetch("GA_SECONDARY_ID", "UA-145652997-1")
 end