@socialdilemmawhattodo
Y6 is currently two form,
Entry to Y7 is automatic from Prep, not exam based, girls not up to standard weed out well in advance of the transition.
11+ is only for Old Palace Prep girls who wish to apply for scholarship, not entry to Y7
70 to 80% of Prep moving to senior is stated on school website, and what my friends tell me , you can check yourself.
Besides, the remaining entries must pass entrance exams which places state primary girls at a disadvantage unless they prep externally, as I stated, the destinations of the local prep schools always include Old Palace- preps like Cumnor House Girls, so this reduces the number also.
Whitgift have withdrawn bursaries for Year 7 for 2024
https://www.oldpalace.croydon.sch.uk/admissions/scholarships-and-bursaries/
Which basically means every parent must be able to fund 20K+ a year.
You say - 'Again your assessment of the class background is not accurate for the senior school - yes of course there are many professional families who value the education provided by the school, but there are many girls from local non-professional Croydon backgrounds.'
Someone who works as an electrician or plumber or craftsman is by defintion a non professional, but they can have a huge income.
My defintion was clumsy , I agree, it should have read; 'are mostly wealthy from South Croydon, Selsdon, etc, that can find 20K each year in just fees from Year 7.'
For those girls enterting the school at 11 in 2024, not one will be on bursaries, so if they are from local state primary schools with 'non-professional parents', they must have money.
My point is OP's original question is silly, you can't have a school asking close to the UK national salary each year in fees alone and expect social diversity. I have no agenda , I just don't believe in fantasy.
As for Coombe Wood, its set up by Folio Eduction who run Wallington Grammar , and two highly rated primaries, so I think they know what they are doing. It does satisfy the checklist of OP, who wants high academic standards with social diversity, something that does not exist at private schools, over 90% of any London private school, the parents must have money. Enough money to find 20K+ per child and still have a home, food , bills and clothes