I sadly know a few of them. It’s a funny mix. Those who have actually worked their asses off and have become successful (quieter ones) mixed with those who are liberal/labour leaning. The latter are dominant in these areas (ignoring the rich overseas lot) and are quite often actors/actresses authors, TV producers and media types. They latch on to the current media stuff. Strong leftish views but loaded.
Discussion
UK is funny like this. Pockets of areas which can almost be defined by the types of people who reside in them. I could reel off a list but probably would take too long. (And would be biased to my views too - should always avoid tarring people and areas with the same brush).