Hmmm -- I lived in East Ham in London for about a year and a half. There are definitely a lot of radical, aggressive Muslims in that area of London. Where do you live?
For what it's worth, I'm in Cambridge and Gloucester and the Muslims I know are certainly not radical in any way- Hell, I'm meeting a Muslim friend of Pakistani descent down the pub tonight.
While several other Muslims I know don't drink (and fair enough), they are no less integrated into general society then anyone else is.
I live in North London, work in South East London and have lived in East London and South London.
Funniest thing I ever saw was a Muslim shop keeper in Leytonstone (about 2miles from East Ham) being fairly brisk with a couple of Eastern European kids. As soon as they left he turned to me and said, "Bloody immigrants! They come over here, they've got no money and they can't even be bothered to learn the language!"