I think fascist red necks would reign in Britain. The papers would be full of racist hate. Your democratic rights and personal freedoms would be so cut to pieces under the guise of what's "good for the country" and for "security". Finally the UK would turn into a paranoid Big Brother state where there are cameras on every street corner keeping all you lemmings in check.
So basically it would be just like it is now except the trains would run on time.
