In my experience, Muslim immigrants to the UK are neither radical not conservative, and are rather keen to integrate and be accepted by their chosen home.
The problems arise, not from the immigrants, but from their children and grand-children, who have never experienced life in the country from which their parents or grandparents fled, and are easily persuaded to a utopian view of living in an Islamic nation, free from the casual racism of their English neighbours.
The first generation say "Well it's not nice to be treated as second class citizens, but it's only a minority of English people who are horrible to us, and our life really is far better than it was back in Whereverstan, and a bit of hostility from the locals is to be expected, so we will make the best of it. That Imam may have had a good life in Whereverstan, but my life was nothing like what he says - if it was so great, I would have stayed there".
The second generation say "We are treated like scum. Back in Whereverstan, we would not be 'different' and would be respected by our neighbours. The Imam is dead right, these decadent western infidels are scum, and someone needs to put them in their place".
If the problem was the immigrants, then the solution would be immigration reform. But it's not; the problem is second and third generation English born people being rejected by the society their parents sought to join. The problem is racism, and ghettoisation - and to a great extent, the existence of religious schools. Kids who go to school with kids of other races and cultures find racism and religious hatred much harder to develop and sustain than those who never had a non-Muslim, or a non-Catholic, or a non-Protestant as a school-friend.