diff --git a/app/cdn/assets/_js/components/wysiwyg.js b/app/cdn/assets/_js/components/wysiwyg.js
index 8849c24b15..775cf8562d 100644
--- a/app/cdn/assets/_js/components/wysiwyg.js
+++ b/app/cdn/assets/_js/components/wysiwyg.js
@@ -7,65 +7,59 @@ var OLCS = OLCS || {};
  * formatting/code it spews out
  */
 
-OLCS.wysiwyg = (function(document, $, undefined) {
-
-  'use strict';
+OLCS.wysiwyg = (function (document, $, undefined) {
+  "use strict";
 
   return function init() {
-
-    OLCS.eventEmitter.on('render', function() {
-
-      if (typeof(tinymce) === 'undefined') {
+    OLCS.eventEmitter.on("render", function () {
+      if (typeof tinymce === "undefined") {
         return;
       }
 
-      $('.tinymce').each(function() {
+      $(".tinymce").each(function () {
         $(this).tinymce({
-          menubar : false,
-          statusbar : false,
-          document_base_url: '../tinymce/',
-          spellchecker_languages : '+English=en',
-          spellchecker_language : 'en',
-          spellchecker_rpc_url: 'index.php',
-          spellchecker_report_misspellings : true,
+          menubar: false,
+          statusbar: false,
+          document_base_url: "../tinymce/",
+          spellchecker_languages: "+English=en_GB",
+          spellchecker_language: "en_GB",
+          spellchecker_rpc_url: "index.php",
+          spellchecker_report_misspellings: true,
           forced_root_blocks: false,
-          height : 260,
-          content_css : '../tinymce/skins/lightgray/custom.css',
+          height: 260,
+          content_css: "../tinymce/skins/lightgray/custom.css",
           style_formats: [
-            {title: 'Header 1', format: 'h1'},
-            {title: 'Header 2', format: 'h2'},
-            {title: 'Header 3', format: 'h3'}
-          ],
-          plugins: [
-            'lists charmap',
-            'searchreplace',
-            'paste spellchecker'
+            { title: "Header 1", format: "h1" },
+            { title: "Header 2", format: "h2" },
+            { title: "Header 3", format: "h3" },
           ],
-          paste_postprocess: function(plugin, args){
-            var elements = args.node.getElementsByTagName('*');
-            for(var i = 0; i < elements.length; i ++){
-              elements[i].className = '';
+          plugins: ["lists charmap", "searchreplace", "paste spellchecker"],
+          paste_postprocess: function (plugin, args) {
+            var elements = args.node.getElementsByTagName("*");
+            for (var i = 0; i < elements.length; i++) {
+              elements[i].className = "";
             }
           },
           paste_as_text: false,
-          toolbar: 'styleselect | bold italic underline | bullist numlist | indent outdent | spellchecker',
-          init_instance_callback: function() {
+          toolbar: "styleselect | bold italic underline | bullist numlist | indent outdent | spellchecker",
+          init_instance_callback: function () {
             lockActions();
           },
-          setup: function(editor) {
-            editor.on('keyup', function() {
-              if (tinymce.activeEditor.getContent()) {// jshint ignore:line
+          setup: function (editor) {
+            editor.on("keyup", function () {
+              if (tinymce.activeEditor.getContent()) {
+                // jshint ignore:line
                 unlockActions();
               } else {
                 lockActions();
               }
             });
-          }
+          },
         });
 
         // If the editor was initialised in a modal, we need to remove it
         // when the modal closes
-        OLCS.eventEmitter.on('hide:modal', function() {
+        OLCS.eventEmitter.on("hide:modal", function () {
           tinymce.EditorManager.editors = []; // jshint ignore:line
         });
       });
@@ -73,19 +67,22 @@ OLCS.wysiwyg = (function(document, $, undefined) {
       // Upon init, we need to lock submit buttons until something actually
       // gets written into tinymce editor, to prevent issues with validation
       function lockActions() {
-        $('.modal').find('.govuk-button-group')
-          .children().first() // the save/submit button
-          .addClass('govuk-button--disabled').prop('disabled', true);
+        $(".modal")
+          .find(".govuk-button-group")
+          .children()
+          .first() // the save/submit button
+          .addClass("govuk-button--disabled")
+          .prop("disabled", true);
       }
 
       function unlockActions() {
-        $('.modal').find('.govuk-button-group')
-          .children().first() // the save/submit button
-          .removeClass('govuk-button--disabled').prop('disabled', false);
+        $(".modal")
+          .find(".govuk-button-group")
+          .children()
+          .first() // the save/submit button
+          .removeClass("govuk-button--disabled")
+          .prop("disabled", false);
       }
-
     });
-
   };
-
-}(document, window.jQuery));
+})(document, window.jQuery);
diff --git a/app/cdn/public/tinymce/plugins/spellchecker/includes/Engine.php b/app/cdn/public/tinymce/plugins/spellchecker/includes/Engine.php
index ecfb6867ac..94546bd955 100644
--- a/app/cdn/public/tinymce/plugins/spellchecker/includes/Engine.php
+++ b/app/cdn/public/tinymce/plugins/spellchecker/includes/Engine.php
@@ -74,7 +74,7 @@ public static function processRequest($tinymceSpellcheckerConfig) {
 		header("Pragma: no-cache");
 
 		$method = self::getParam("method", "spellcheck");
-		$lang = self::getParam("lang", "en_US");
+		$lang = self::getParam("lang", "en_GB");
 		$text = self::getParam("text");
 
 		if ($method == "spellcheck") {
@@ -165,4 +165,4 @@ public static function getWords($text) {
 	}
 }
 
-?>
\ No newline at end of file
+?>