Approaching Britwell things don't seem to difficult, the road just looks like it simply rises gently over the ridge and as it's straight it looks short. However once on the climb (of just under a kilometer) the gradient increasing throughout and you are quickly in a world of pain. It's not long but it somehow drags on so much longer than you expect with the steepest section at the top. Many clubs have staged their hill champs here. It can be seen in the films Chitty Chitty Bang Bang and Bridget Jones Diary.