LadySanders - anything relating to private school on here always gets the odd person ready to have a pop, regardless of the nature of the thread.
IME the ones with the most money seem to be the ones who dress down most earlier in the school years. Rest of us just catching up with the idea, lol!
And yes, as I said before, when we were doing the initial Open Days and school visits, prior to DD going to school, both DH and I - and DD (who came along to all of them with us as I was intersted to see how the staff interacted with her way more than with me) - were dressed smartly, but not too formal or OTT. And that was regardless of whether the school was independnent or state.
And no, I guess DD's school doesn't offer the widest range of social backgrounds. It does offer a fantastic education and pastoral setting for a wide range of pupils, covering many nationalities and cultures. It also takes in children without English as Foriegn Langauge etc - one Greek girl came to school with no English, was oput in year below her chronological age (more flexibility than in state for this I know) and she is now doing fantastically well. But yes, somewhere along the line parents do need to be able to fund the £2.5k termly fee (Sheffield so a bit cheaper) - but they are not all rich. Some have grandparents paying, some godparents, some just have the cash, some are scrimping to afford it, and some are in the middle of all that. DD's school doesn't have busaries and scholarships until the final years IIRR.
But thereagain the first state secondary school I worked in had even less of a social mix. It was in a very middle class area, where house prices were very high and the catchment not huge. It was to all intents and purposes quite selective in that sense.