Two-thirds of British Muslims only mix socially with other Muslims; that portion is undoubtedly higher among Pakistanis and Bangladeshis specifically. Reinforcing this parallel life is the common practice of returning “home” for a few months every two or three years and an immersion in foreign electronic media. Integration into a wider national life is further hindered—and the retention of a deeply foreign culture is further encouraged—by the fact that most Pakistani marriages, even if one spouse is born in Britain, essentially produce first-generation-immigrant children: the one study that measured this phenomenon, conducted in the north England city of Bradford, found that 85 percent of third- and fourth-generation British Pakistani babies had a parent who was born in Pakistan. (Incidentally, that study also found that 63 percent of Pakistani mothers in Bradford had married their cousins, and 37 percent had married first cousins.)