Grammar's really aren't posh!
The whole point of being selective is that you take across the ability range, rather than the economic, so you generally get a wide range of people. It tends to be middle classish usually- the pushy parents, but upper class send their children to private schools anyway.

Edit: as berk points out, whether they're feepaying or not makes a difference but not a huge one. It's pretty much like being in a school in a really good economic catchment area
( Amberl was stripey and dominated Europe, Tue 23 Nov 2010, 14:45, 1 reply, 15 years ago)

This
Alright, so my school has pretty good results because it's selective about whom it lets in - but equally, there are other schools in the area whose results are better and the parents richer, simply because of the catchment areas they serve.
(berk, Tue 23 Nov 2010, 14:49, Reply)