When approaching the roundabout, zoom in on the navigation page, and it will be very clear which exit to take! If you make a mistake, never exit, just keep turning until you get it right! We spent a lot of time circling around the roundabout near Heathrow Airport on the first day and missed visiting Cambridge. Now I feel a bit regretful. Later, when we went around the roundabout again, it was a piece of cake ? United Kingdom Q&A