Well you won't mind when all the multinationals (if there are any!!) move out, when you no longer get any goods from anywhere because you blew up the bridges (and any that do get there would be 10x the price because of the logistic problems and the fact you have **** all purchasing power), when you get Iraq nuking the bejesus out of you because you ain't got any kind of defense whatsoever (they desperatly want to hurt Britain, they don't care if you don't see yourself as part of it) and when your tourism industry completely dies because nobody can get there without a lot of hassle.

Yeah, fan-****ing-tastic idea sunshine, rock on that man, give the dude a medal.