As a UK national who occasionally teaches English to non-native speakers, I am often asked about my own accent which some of my students think is very unusual.
I was brought up in West London in the 1980s. The cultural groups with whom I was surrounded were mainly of English, Irish, West Indian and Caribbean origin. Accordingly, they were native English speakers albeit with a very wide variety of accents. Each first generation group had its own sound but the second generation, with whom I attended school, mostly spoke in a fairly unremarkable London accent of the type that you just don’t really hear any more. I guess this is why younger non-native English speakers ask me about mine.