I see. One question:
If the British weren't successful in socially integrating the American colonists who were clamoring for liberty back over 220 years ago, why would the British now think they're going to be any more successful today in socially integrating an alien tribal culture of religious zealots with whom they don't even share common ground on basic ideology?
George Washington was a hell of a lot closer in spirit and mindset to the Englishmen he ultimately won a bloody gunfight against than even the most appealing Muslim immigrant to the UK presently is.
Honestly now, Britain: How about asking the Americans how we think your plans are going to work out for you. Aren't we like YOUR subject matter experts on this topic, for crying out loud?
Muslims have been in the UK since the 1950s and until some in 1989 caused trouble over the Rushdie affair, had not been any trouble. Most HAD to a great extent assimilated, but the last 20-25 yrs of radicalism allied to the myopic post 60s ideology of multiculturalism has allowed the younger generation and middle aged generation to self-segregate in a way their parents/grandparents didn’t and weren’t allowed to.