London being the most diverse city on the planet (at least as far as I can tell), there's no point saying, "Maybe it's worth trying to learn some of their language." You're probably talking about fifteen or so languages. As for acculturation, surely you've heard of Mangelsdorf's Law? When two cultures meet, each will absorb the other's worst characteristics. (Erm, irony alert, okay?) So, let's see, the Brits will become sexist, tyrannical jerks, while the non-Brits will become ... what? ... bureaucrats who tell incomprehensible jokes? Hmm, even in that case, maybe the non-Brits would do well to go for a bit of acculturation? ??