diff --git a/app/assets/javascripts/analytics.js.erb b/app/assets/javascripts/analytics.js.erb
index cd36ec289..8ebbebb46 100644
--- a/app/assets/javascripts/analytics.js.erb
+++ b/app/assets/javascripts/analytics.js.erb
@@ -144,3 +144,15 @@ window.GOVUK.analyticsVars.linkedDomains = linkedDomains
 if (typeof window.GOVUK.analyticsInit !== 'undefined') {
   window.GOVUK.analyticsInit()
 }
+
+<% if ENV["GOOGLE_TAG_MANAGER_ID"] %>
+  if (typeof window.GOVUK.analyticsGA4.init !== 'undefined') {
+    window.GOVUK.analyticsGA4 = window.GOVUK.analyticsGA4 || {}
+    window.GOVUK.analyticsGA4.vars = window.GOVUK.analyticsGA4.vars || {}
+    window.GOVUK.analyticsGA4.vars.id = '<%= ENV["GOOGLE_TAG_MANAGER_ID"] %>'
+    window.GOVUK.analyticsGA4.vars.auth = '<%= ENV["GOOGLE_TAG_MANAGER_AUTH"] %>'
+    window.GOVUK.analyticsGA4.vars.preview = '<%= ENV["GOOGLE_TAG_MANAGER_PREVIEW"] %>'
+
+    window.GOVUK.analyticsGA4.init()
+  }
+<% end %>
diff --git a/app/views/root/_error_page.html.erb b/app/views/root/_error_page.html.erb
index 4740d32fc..dc3d67725 100644
--- a/app/views/root/_error_page.html.erb
+++ b/app/views/root/_error_page.html.erb
@@ -11,16 +11,6 @@
   global_bar = render "components/global_bar"
 %>
 
-<% content_for :head do %>
-  <% if ENV["GOOGLE_TAG_MANAGER_ID"] %>
-     <%= render "govuk_publishing_components/components/google_tag_manager_script", {
-       gtm_id: ENV["GOOGLE_TAG_MANAGER_ID"],
-       gtm_auth: ENV["GOOGLE_TAG_MANAGER_AUTH"],
-       gtm_preview: ENV["GOOGLE_TAG_MANAGER_PREVIEW"]
-     } %>
-  <% end %>
-<% end %>
-
 <%= render "govuk_publishing_components/components/layout_for_public", {
   emergency_banner: emergency_banner,
   full_width: false,
diff --git a/app/views/root/_gem_base.html.erb b/app/views/root/_gem_base.html.erb
index 16559cfb6..b4308c4b4 100644
--- a/app/views/root/_gem_base.html.erb
+++ b/app/views/root/_gem_base.html.erb
@@ -30,16 +30,6 @@
   global_bar << global_banner if global_banner
 %>
 
-<% content_for :head do %>
-  <% if ENV["GOOGLE_TAG_MANAGER_ID"] %>
-     <%= render "govuk_publishing_components/components/google_tag_manager_script", {
-       gtm_id: ENV["GOOGLE_TAG_MANAGER_ID"],
-       gtm_auth: ENV["GOOGLE_TAG_MANAGER_AUTH"],
-       gtm_preview: ENV["GOOGLE_TAG_MANAGER_PREVIEW"]
-     } %>
-  <% end %>
-<% end %>
-
 <%= render "govuk_publishing_components/components/layout_for_public", {
   account_nav_location: account_nav_location,
   draft_watermark: draft_environment,
diff --git a/test/integration/google_tag_manager_component_test.rb b/test/integration/google_tag_manager_component_test.rb
deleted file mode 100644
index b0be68687..000000000
--- a/test/integration/google_tag_manager_component_test.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-require "integration_test_helper"
-
-class GoogleTagManagerComponentTest < ActionDispatch::IntegrationTest
-  context "GTM environment variables are present" do
-    should "render the GTM component on the gem_base template" do
-      ClimateControl.modify GOOGLE_TAG_MANAGER_ID: "a-nice-id" do
-        visit "/templates/gem_layout.html.erb"
-        assert_match "https://www.googletagmanager.com/gtm.js", page.body
-      end
-    end
-  end
-
-  context "GTM environment variables are absent" do
-    should "not render the GTM component on the gem_base template" do
-      visit "/templates/gem_layout.html.erb"
-      assert_no_match "https://www.googletagmanager.com/gtm.js", page.body
-    end
-  end
-end