Hence we have vast tracts of formerly industrial towns and cities that are "little" Indias, Pakistans, Jamaicas (don't forget the West Indians are still in this topic), you name it
A colleague of mine, who is now in his 40s, was eight, when his family moved from India to the UK and settled in Southall.
He was telling me about the shop that had been at the end of their road when they first arrived. He then said "of course it's a bloody sari shop now, the trouble with Southall now is there's too many Indians living there, not like when I was a kid, it was a good mix then"
Good post and I would agree with all, except the date of the navvies. I think it's much earlier.
They built the railways in the 1800s, that's where the term navi comes from, it's short for navigator