There is a choice of contemporary (Common Worship) or traditional (Book of Common Prayer) - the contemporary service is below or scroll further down the page for the traditional service.
The service should begin playing when you click on the center of the image below. You will find it helpful to print off the order of service which can be found by clicking on the blue square titled "This week's order of service" below that. There should not be any problems, however, if you are struggling to hear the service it might be that you need to listen to the video through headphones or an external speaker, this is because YouTube and the built-in speakers on some mobile devices occasionally have difficulty communicating.
To make the video fill your screen again hover your cursor over the video and click on the small square on the bottom right-hand corner.