immigrants' children are would possibly very heavily influenced by old country values, through their parents. i'd personally give it another generation before considering their opinions those of a section of the "british" population.
serioulsly, i know pakistanis in the US who don't think 11 september '01 was that bad a deal. i mean they feel bad for the people dead, if they think about it, but can easily ignore that 'minor' detail, and think that in principle it was a good thing and usama bin laden is a great guy. honestly, i tell these people it's because of people like them that the world is a shitty place, and that they should leave the country if they feel that way.