Selection Criteria for Westminster School
(a) be a boy - that is half the kids ruled out (250,000 out of 500,000)
(b) live within sane travelling distance of SW1 ( rules out around 150,000 of the 250,000)
(c) happy with a Christian ethos school (rules out another 25,000 of the 100,000)
and only then
(d) able to pay the fees ( being generous, 15% of the population of London can, so another 63,750 gone)
so that is a maximum market of 11,250 boys
fighting for lots and lots of available school places in London
even before they sit the exam and filter out the "nice but dims"
The whole number of applicants debate is an utter red herring because
one child can only take one school place, but can make multiple school applications
When I was leaving Junior school I applied for about 8 schools and was offered places at several - including a couple of scholarships if I remember - and then circumstances changed and I went somewhere completely different.
There can be no most selective school in England because there is no possible free market in pupils.
I don't doubt that Westminster picks, grooms and pops out very bright boys (and girls in 6th form) but they are selecting from a very small corner of the pond.
Top Universities, because they are all live in have a much bigger pond to fish from.