Do Britons actually eat this type of thing ?

Dont knock it until you have tried it lol. A deep fried mars bars nice! it tastes like a pancake! it mite sound weird but its not. Im from london, its not like a delicacy round here its just some thing you can get if you want! not a big deal. Go and buy a mars bar take it to a fish and chip shop and ask them to batter it, you will like it i guarantee.