I think to greater or lesser degrees you could make virtually the same claim about any sizable ethnic enclave or group in a new host country, especially if looking over the worst elements or examples. People in the U.S. said exactly the same thing about ties to the mother country and the U.S. being ruled from Rome when the big recent groups were the Irish and Italians and both groups were rife with gang and mafia activity. Fast forward a few generations and the idea that they were regressive people who'd never blend into the mainstream is kinda silly.
But in specific you say they're less integrated. Are you seriously saying they speak less English than their parents' generation? Are less connected with English or British culture, despite growing up in it and going to British schools? That seems rather far fetched.
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