Having been in Canada for a week now, I have to say that Britain is certainly way bustier than North America! There really is no comparison - the girls over here are so much more flat-chested, generally. I still feel certain that the 'average' cup size in Britain is a B only because people buy the wrong size (I'm sure most women, as they grow, move from buying a 34B to a 36B, thinking that's their size, when in fact they should be wearing a 34C - it's amazing how many people actually think a 36B is the same as a 34C).