I grew up in london, but now live in a 'County'.
Apparently I look Polish.
I'm not. 
The number of people here who've expressed utter relief at finding out I am actually 'English' is extraordinary. I've never known anything like it.
Then they go all odd again when I tell them I'm not English, but was brought up here, am white, and have aquired the accent.
I grew up in West London in the 70s/80s.
We were bonded together at our Catholic schools by poverty, and being 90% non-English. We were constantly being made to feel like 'others', not English/British, but tolerated.
London university, people from everywhere, bonded together by a common interest.
The UK, especially outside of the big university communities, is very racist.