"Children sniff out wealth, just as they sniff out who rents an ex council flat. Many London schools have very wealthy parents and it certainly can be obvious. Children do talk to each other! "
I bow to other posters greater experience, but that was not our experience at all. The great thing about London is its anonymity. Of course there were some very rich, some kids on bursaries, and some just about managing to pay the fees. But it did not matter, not in our experience. (Just as well in our case.) The school operates as a boarding school so you can come in early and leave late. You have Saturday morning school and can go in and meet your friends on Sunday. It is reasonably rare to go to other people's houses, and when you do you are more likely to go somewhere close, so more likely to be rented. Parents too will come from all over London and beyond, so when meeting them you have no idea how senior they are, what car they drive, what kind of house they live in, or what golf club they belong to. Indeed I am not sure I ever met a Westminster parent who belonged to a golf club, because conversation was usually around children and the school. I would agree with Sanam that parents were normally interesting and nice. Quiz night though was quite an eye-opener. quite a number were very very clever indeed.
Westminster is selective. There are some extra ordinarily talented pupils. You would hear about kids because of academic, sporting, musical or other achievements. Or for being nice, or daft or whatever. Wealth really never came up, other than the odd mention of a kid who unwisely flaunted it...decidedly uncool.
But I think that London, especially Central London, is different in that respect. I spend a lot of time in an expensive bit of Dorset, where I manage rental property for a relative, and am surprised at the number of personalised number places, flash cars, interior designers, and so on. Because of house inflation our London house is probably worth more then theirs, but we don't look rich, our car is old and there is a sense of being judged, in a way that never happened at Westminster.