Also, being educated at a grammar doesn't, or shouldn't, mean you're getting a 'better' education.
It should mean you're getting one suited to your needs.
If, like my best friend at school, you struggle for 7 years, being constantly told you're a bit feeble, really, & then fail all your O-Levels because the school doesn't do CSEs, then it's a really, really crap education.
Ultimately, I enjoyed my grammar education & I do feel that I'd've done less well elsewhere, simply because I'm one of nature's slackers & could have coasted at a less academic school.
I now teach at a (successful) comp - no grammars in our LA - & can honestly say that bright, motivated children with supportive parents do very, very well.
It's the bright ones who don't have clued-up, supportive parents who'd benefit most from the 'escape hatch' of a grammar - & of course they're the least likely to get anywhere near one, in a culture of middle class tutoring.
It's a shame. I'd like to defend grammar schools, but threads like this increasingly bring home to me that my experience in the '80s is terribly far removed from the current reality.
& tbh, getting a place & then struggling was & is a poor outcome...