Sorry to add some more logic and rationale to this discussion, but :::::
I can quite believe that here are areas like those mentioned by BOO in Britain, but if so many Muslims ARE concentrated ind a few areas like that, then it must follow that there are plenty of places in Britain where Muslims are seldom, if ever seen !
Go to the West Country, or Wales, or the South Coast, and see how many brown faces there are. I have very little experience of Scotland, but I would presume that the same could be said there.