diff --git a/lib/source/layouts/_google_tag_manager_js.erb b/lib/source/layouts/_google_tag_manager_js.erb
new file mode 100644
index 00000000..1715bc57
--- /dev/null
+++ b/lib/source/layouts/_google_tag_manager_js.erb
@@ -0,0 +1,12 @@
+<% if config[:tech_docs][:gtm_id].is_a?(String) && !config[:tech_docs][:gtm_id].empty? %>
+  <script>
+    (function(w,d,s,l,i){
+      w[l]=w[l]||[];
+      w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});
+      var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';
+      j.async=true;
+      j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;
+      f.parentNode.insertBefore(j,f);
+    })(window,document,'script','dataLayer','<%= config[:tech_docs][:gtm_id] %>');
+  </script>
+<% end %>
diff --git a/lib/source/layouts/_google_tag_manager_non_js.erb b/lib/source/layouts/_google_tag_manager_non_js.erb
new file mode 100644
index 00000000..e666b452
--- /dev/null
+++ b/lib/source/layouts/_google_tag_manager_non_js.erb
@@ -0,0 +1,4 @@
+<% if config[:tech_docs][:gtm_id].is_a?(String) && !config[:tech_docs][:gtm_id].empty? %>
+  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=<%= config[:tech_docs][:gtm_id] %>"
+                    height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
+<% end %>
diff --git a/lib/source/layouts/core.erb b/lib/source/layouts/core.erb
index 29fbb481..646aea34 100644
--- a/lib/source/layouts/core.erb
+++ b/lib/source/layouts/core.erb
@@ -19,10 +19,12 @@
       <%= tag :meta, property: property, content: content %>
     <% end %>
 
+    <%= partial 'layouts/google_tag_manager_js' %>
     <%= yield_content :head %>
   </head>
 
   <body class="govuk-template__body">
+    <%= partial 'layouts/google_tag_manager_non_js' %>
     <script>document.body.className = ((document.body.className) ? document.body.className + ' js-enabled' : 'js-enabled');</script>
 
     <div class="app-pane">
diff --git a/package-lock.json b/package-lock.json
index 60d5b363..6b939037 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2662,9 +2662,9 @@
       }
     },
     "node_modules/word-wrap": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
-      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.4.tgz",
+      "integrity": "sha512-2V81OA4ugVo5pRo46hAoD2ivUJx8jXmWXfUkY4KFNw0hEptvN0QfH3K4nHiwzGeKl5rFKedV48QVoqYavy4YpA==",
       "dev": true,
       "engines": {
         "node": ">=0.10.0"
@@ -4722,9 +4722,9 @@
       }
     },
     "word-wrap": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
-      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.4.tgz",
+      "integrity": "sha512-2V81OA4ugVo5pRo46hAoD2ivUJx8jXmWXfUkY4KFNw0hEptvN0QfH3K4nHiwzGeKl5rFKedV48QVoqYavy4YpA==",
       "dev": true
     },
     "wrappy": {
diff --git a/repository.yaml b/repository.yaml
new file mode 100644
index 00000000..5974257c
--- /dev/null
+++ b/repository.yaml
@@ -0,0 +1 @@
+repoVisibility: public_0C3F0CE3E6E6448FAD341E7BFA50FCD333E06A20CFF05FCACE61154DDBBADF71
\ No newline at end of file
