I guess you dont come into contact with many muslims, if you did I'm sure your veiws on integration would change. Try spending a day in Smethwick, Tipton, Dudley, Walsall, Darlaston, Wolverhampton, West Brom, infact most towns and cities here in the black country and you'll find huge areas where asians live. They simply do not integrate, I'm not being racist I'm just stating a fact.
Sikhs and Hindus around here have integrated perfectly so why cant muslims.
I used to live next door to a Sikh, his missus made the best samosa's and curries I've ever had. We're still very good friends, he meets up with us in our local pub and puts us all to shame, god that man can drink.
I live about 500 yards from a big Guru Nanak temple, the Sikhs there are wonderfull people, nothing like the muslims that push into you and spit everywhere.
I know I shouldn't tar them all with the same brush but there's thousands around here and I've never met a nice one.