I love British Mars Bars. The closest thing we have in the states is Milky Way but it's not quite the same. The nougat is a little off in flavor.
We have Milky Way's too, and your right, the nougats just not the same, it's too white and milky, the nougat.
Have you ever tried a fried mars bar? They dip it in batter, and fry it, it sounds disgusting, and.....it is, but it's something you need to try before you die.
I was watching this Documentary about The Simpsons on Fox last night and there was a segment over whether Groundkeeper Willy was from Glasgow or Aberdeen. At one point, it went over all the achievements of Glasgow and the deep fried Mars Bar was one.