Majority of British Muslims is not like this......there are only hand full of these type of people.
The problem with British Pakistanis is that most of them came as laborers and were just let in without a filtration process that occurs to Pakistanis wanting to immigrate to USA or Canada.
When they got there, they started sponsoring their relatives and marrying their cousins in Pakistan hoping they will come to UK as well. So what you have is an entire educational and mental mindset of British Pakistanis who come from rural poor areas of Mirpur.
They lack the educational background to adapt to Western values. And that is why they revert back to their own identity which is Islam. And that is why you see so much extremism from them. It is a major culture shock to them that does not occur to the more educated Pakistanis living in Canada or USA.