diff --git a/app/assets/javascripts/analytics/scroll-tracker.js b/app/assets/javascripts/analytics/scroll-tracker.js
index 723af000b..2295a808f 100644
--- a/app/assets/javascripts/analytics/scroll-tracker.js
+++ b/app/assets/javascripts/analytics/scroll-tracker.js
@@ -97,21 +97,6 @@
     }
   };
 
-  ScrollTracker.PercentNode = function (percentage) {
-    this.percentage = percentage;
-    this.eventData = {action: "Percent", label: String(percentage)};
-  };
-
-  ScrollTracker.PercentNode.prototype.isVisible = function () {
-    return this.currentScrollPercent() >= this.percentage;
-  };
-
-  ScrollTracker.PercentNode.prototype.currentScrollPercent = function () {
-    var $document = $(document);
-    var $window = $(window);
-    return( ($window.scrollTop() / ($document.height() - $window.height())) * 100.0 );
-  };
-
   ScrollTracker.HeadingNode = function (headingText) {
     this.$element = getHeadingElement(headingText);
     this.eventData = {action: "Heading", label: headingText};
diff --git a/spec/javascripts/analytics/scroll-tracker-spec.js b/spec/javascripts/analytics/scroll-tracker-spec.js
index e8b4e80ce..4aa860b87 100644
--- a/spec/javascripts/analytics/scroll-tracker-spec.js
+++ b/spec/javascripts/analytics/scroll-tracker-spec.js
@@ -10,9 +10,16 @@ describe("GOVUK.ScrollTracker", function() {
   });
 
   describe("enabling on correct pages", function() {
+    var FIXTURE = "<h1>A heading</h1>";
+
+    beforeEach(function() {
+      setFixtures(FIXTURE);
+      spyOn(GOVUK.ScrollTracker.HeadingNode.prototype, 'elementIsVisible');
+    });
+
     it("should be enabled on a tracked page", function() {
       var config = {}
-      config[window.location.pathname] = [ ['Percent', 50] ];
+      config[window.location.pathname] = [ ['Heading', 'A heading'] ];
 
       expect( (new GOVUK.ScrollTracker(config)).enabled ).toBeTruthy();
     });
@@ -20,34 +27,13 @@ describe("GOVUK.ScrollTracker", function() {
     it("should not be enabled on an untracked page", function() {
       var config = {
         '/some/other/path': [
-          ['Percent', 50]
+          ['Heading', 'A heading']
         ]
       };
       expect( (new GOVUK.ScrollTracker(config)).enabled ).toBeFalsy();
     });
   });
 
-  describe("tracking by scrolled percentage", function() {
-    beforeEach(function() {
-      spyOn(GOVUK.ScrollTracker.PercentNode.prototype, "currentScrollPercent");
-    });
-
-    it("should send an event when the page scrolls to >= the percentage specified", function() {
-      var config = buildConfigForThisPath([
-        ['Percent', 25],
-        ['Percent', 50],
-        ['Percent', 75]
-      ]);
-      new GOVUK.ScrollTracker(config);
-
-      scrollToPercent(60);
-
-      expect(GOVUK.analytics.trackEvent.calls.count()).toBe(2);
-      expect(GOVUK.analytics.trackEvent.calls.argsFor(0)).toEqual(["ScrollTo", "Percent", {label: "25", nonInteraction: true}]);
-      expect(GOVUK.analytics.trackEvent.calls.argsFor(1)).toEqual(["ScrollTo", "Percent", {label: "50", nonInteraction: true}]);
-    });
-  });
-
   describe("tracking by headings", function() {
     var FIXTURE = "\
       <h1>This is the first <span>heading</span></h1>\
@@ -59,15 +45,14 @@ describe("GOVUK.ScrollTracker", function() {
     beforeEach(function() {
       setFixtures(FIXTURE);
       spyOn(GOVUK.ScrollTracker.HeadingNode.prototype, 'elementIsVisible');
-    });
-
-    it("should send an event when the user scrolls so the heading is visible", function() {
       var config = buildConfigForThisPath([
         ['Heading', "This is the first heading"],
         ['Heading', "This is the third heading"]
       ]);
       new GOVUK.ScrollTracker(config);
+    });
 
+    it("should send an event when the user scrolls so the heading is visible", function() {
       scrollToShowHeadingNumber(1);
 
       expect(GOVUK.analytics.trackEvent.calls.count()).toBe(1);
@@ -82,34 +67,22 @@ describe("GOVUK.ScrollTracker", function() {
       expect(GOVUK.analytics.trackEvent.calls.count()).toBe(2);
       expect(GOVUK.analytics.trackEvent.calls.argsFor(1)).toEqual(["ScrollTo", "Heading", {label: "This is the third heading", nonInteraction: true}]);
     });
-  });
 
-  it("should not send duplicate events", function() {
-    spyOn(GOVUK.ScrollTracker.PercentNode.prototype, "currentScrollPercent");
-
-    var config = buildConfigForThisPath([
-      ['Percent', 25]
-    ]);
-    new GOVUK.ScrollTracker(config);
+    it("should not send duplicate events", function() {
+      scrollToShowHeadingNumber(1);
+      scrollToShowHeadingNumber(3);
+      scrollToShowHeadingNumber(1);
 
-    scrollToPercent(30);
-    scrollToPercent(35);
-    expect(GOVUK.analytics.trackEvent.calls.count()).toBe(1);
+      expect(GOVUK.analytics.trackEvent.calls.count()).toBe(2);
+    });
   });
 
-
   function buildConfigForThisPath(thisPathData) {
     var config = {};
     config[window.location.pathname] = thisPathData;
     return config;
   }
 
-  function scrollToPercent(percent) {
-    GOVUK.ScrollTracker.PercentNode.prototype.currentScrollPercent.and.returnValue(percent);
-    $(window).scroll();
-    jasmine.clock().tick(510);
-  };
-
   function scrollToShowHeadingNumber(headingNumber) {
     var elementScrolledTo = $('h1, h2, h3, h4, h5, h6')[headingNumber-1];
     GOVUK.ScrollTracker.HeadingNode.prototype.elementIsVisible.and.callFake(function($element) {