diff --git a/app/assets/javascripts/colourPreview.js b/app/assets/javascripts/colourPreview.js
deleted file mode 100644
index 05d82e64b..000000000
--- a/app/assets/javascripts/colourPreview.js
+++ /dev/null
@@ -1,29 +0,0 @@
-(function(Modules) {
-  "use strict";
-
-  let isSixDigitHex = value => value.match(/^#[0-9A-F]{6}$/i);
-  let colourOrWhite = value => isSixDigitHex(value) ? value : '#FFFFFF';
-
-  Modules.ColourPreview = function() {
-
-    this.start = component => {
-
-      this.$input = $(component);
-
-      this.$input.closest('.usa-form-group').append(
-        this.$preview = $('<span class="textbox-colour-preview"></span>')
-      );
-
-      this.$input
-        .on('input', this.update)
-        .trigger('input');
-
-    };
-
-    this.update = () => this.$preview.css(
-      'background', colourOrWhite(this.$input.val())
-    );
-
-  };
-
-})(window.GOVUK.Modules);
diff --git a/tests/javascripts/colourPreview.test.js b/tests/javascripts/colourPreview.test.js
deleted file mode 100644
index 855c2a048..000000000
--- a/tests/javascripts/colourPreview.test.js
+++ /dev/null
@@ -1,139 +0,0 @@
-const helpers = require('./support/helpers.js');
-
-beforeAll(() => {
-  require('../../app/assets/javascripts/colourPreview.js');
-});
-
-afterAll(() => {
-  require('./support/teardown.js');
-});
-
-describe('Colour preview', () => {
-
-  let field;
-  let textbox;
-  let swatchEl;
-
-  beforeEach(() => {
-
-    // set up DOM
-    document.body.innerHTML = `
-      <div class="usa-form-group">
-        <label class="govuk-form-label" for="colour">
-          Colour
-        </label>
-        <input class="govuk-input govuk-input--width-6" id="colour" name="colour" rows="8" type="text" value="" data-module="colour-preview">
-      </div>`;
-
-    field = document.querySelector('.usa-form-group');
-    textbox = document.querySelector('input[type=text]');
-
-  });
-
-  afterEach(() => {
-
-    document.body.innerHTML = '';
-
-  });
-
-  describe("When the page loads", () => {
-
-    test("It should add a swatch element for the preview", () => {
-
-      // start the module
-      window.GOVUK.modules.start();
-
-      swatchEl = document.querySelector('.textbox-colour-preview');
-
-      expect(swatchEl).not.toBeNull();
-
-    });
-
-    test("If the textbox is empty it should make the swatch white", () => {
-
-      // start the module
-      window.GOVUK.modules.start();
-
-      swatchEl = document.querySelector('.textbox-colour-preview');
-
-      // textbox defaults to empty
-      // colours are output in RGB
-      expect(swatchEl.style.background).toEqual('rgb(255, 255, 255)');
-
-    });
-
-    test("If the textbox has a value which is a hex code it should add that colour to the swatch", () => {
-
-      textbox.setAttribute('value', '#00FF00');
-
-      // start the module
-      window.GOVUK.modules.start();
-
-      swatchEl = document.querySelector('.textbox-colour-preview');
-
-      // colours are output in RGB
-      expect(swatchEl.style.background).toEqual('rgb(0, 255, 0)');
-
-    });
-
-    test("If the textbox has a value which isn't a hex code it should make the swatch white", () => {
-
-      textbox.setAttribute('value', 'green');
-
-      // start the module
-      window.GOVUK.modules.start();
-
-      swatchEl = document.querySelector('.textbox-colour-preview');
-
-      // colours are output in RGB
-      expect(swatchEl.style.background).toEqual('rgb(255, 255, 255)');
-
-    });
-
-  });
-
-  describe("When input is added to the textbox", () => {
-
-    beforeEach(() => {
-
-      // start the module
-      window.GOVUK.modules.start();
-
-      swatchEl = document.querySelector('.textbox-colour-preview');
-
-    });
-
-    test("If the textbox is empty it should make the swatch white", () => {
-
-      helpers.triggerEvent(document.querySelector('input[type=text]'), 'input');
-
-      // textbox defaults to empty
-      expect(swatchEl.style.background).toEqual('rgb(255, 255, 255)');
-
-    });
-
-    test("If the textbox has a value which is a hex code it should add that colour to the swatch", () => {
-
-      textbox.setAttribute('value', '#00FF00');
-
-      helpers.triggerEvent(document.querySelector('input[type=text]'), 'input');
-
-      // textbox defaults to empty
-      expect(swatchEl.style.background).toEqual('rgb(0, 255, 0)');
-
-    });
-
-    test("If the textbox has a value which isn't a hex code it should make the swatch white", () => {
-
-      textbox.setAttribute('value', 'green');
-
-      helpers.triggerEvent(document.querySelector('input[type=text]'), 'input');
-
-      // textbox defaults to empty
-      expect(swatchEl.style.background).toEqual('rgb(255, 255, 255)');
-
-    });
-
-  });
-
-});