TBH, the benefit of attending a public school wasn't the point of my post. If we move back to a grammar school and secondary modern system, we'll end up with wealthy parents doing the best for their children and putting in the money and time to get their offspring to the required entrance standard so they get those places. The offspring of less wealthy people will not be able to afford to do the same, so their equally talented children will not get the education their potential deserves. They deserve better. We as a society deserve to aim higher.
I believe you're right about Holland Park. I didn't go there, but had friends who did. It was one of the first comprehensive schools, I believe, and my friends who attended in the early '70s seemed to get a pretty decent education.
My mother passed the 11 plus to go to West Ken Grammar, but within a year or so it was comprehensivised and she ended up at Holland Park. This would have been early 60s - even before Wilson was elected - and she said it was a great school then.
If they bring them back now it will be for parents who 40 years ago would have sent their kids private - the clever kids from disadvantaged homes will get pushed aside by richer (and thicker) children benefiting from private tutoring.