Head
The point I was trying to make wrt admissions (perhaps badly) is that as we don't interview (a huge mistake IMO but hey ho), we only have personal statements and predicted grades or actual grades to go on.
Generally speaking private schools "coach" their students on how to write personal statements and obviously they put a lot of effort into ensuring they end up with decent grades. So they look great on paper. However when they arrive (some obviously, many are of course very intelligent), it quickly becomes apparent that they have very little natural intelligence; they've simply been taught to express themselves in the correct and most desired manner.
I suppose many would say "well that's why I send my dc to private school, so they get the best outcome they can". However it's not fair on a state school candidate from a disadvantaged background who in some cases is much more intelligent than the privately educated candidate but simply hasn't been "coached". The result is many universities simply end up with clones.
I went to university and so did my DH, and we both value education and earn a fairly decent wage. This means our own dc are naturally more advantaged over children from disadvantaged backgrounds whose parents did not attend university and/or do not value education. I see no reason, and in fact believe it to be morally wrong, to perpetuate that advantage even further by sending my dc to private school.
From my own anecdotal experience I went to two schools, one for my GCSEs and another for my A levels. First one was inner city East London comp, 35% GCSE pass rate, 75% boys. Most of the middle class parents in the catchment area chose to go private or send to grammar school. The result was the school was largely one demographic of fairly disadvantaged children. Standards low. Teachers didn't expect much.
Second school in similar area but no privates or grammars nearby. Much more mixed socio economic demographic. Standards much much higher. Teachers expected more. Results better.
I've heard many parents say why should I send my child to a shit school for the benefit of other children? Fine. But if that attitude persists then basically society will always be ruled by a handful of privileged individuals. It shouldn't be that way.
And again anecdotally, I went to a "shit" school and got good GCSEs, 4 A grade A levels and a first class degree (and then an MA) from a RG university.