By whom and can you give the quote?
Are you claiming that this claim has been researched,

Jim, all three of them, and Jack Straw, and Anne Cryer, separately stated their beliefs that various aspects of culture led to the problem under discussion.
Do you deny that Jim?
Obviously there is no one quote.

The research in the case of Straw and Cryer was a career spent representing large Pakistani constituencies.

In the case of the three Pakistanis it was a life time of service to the Pakistani communities they were born into.