Thanks for the replies. I agree that the one down side is that I won't easily be able to return them, but like you said that is unlikely since they are widely known as one of the best headsets. Also I've tried them on so I know I find them comfortable, I just don't know how well they work in the air.
As for them being fragile that was what my 2nd question was about. As I read the US and UK bose websites it looks like they would have a worldwide warrenty, can anyone confirm this?
I'm just not sure if its worth the extra £250 to buy them here in the UK.