Inthegutter, I am a teacher in the state sector and come from a family of teachers. I have worked in a lot of state schools in various different areas (I have taught GCSE classes in at least 5 local schools) in various capacities. I am pretty well-read in all kinds of research into education. However, my decision to send my kids to a private school is ultimately a personal one based on my personal experience and my personal hopes and expectations for my own children. It is a decision I have made which in some ways has gone against my wider principles (though as I've said earlier in the age of increasing faith schools, league tables and middle-class choice I feel less guilty about it than I would if all of us had only the choice between our nearest state comp or private).
I went to a state comp. I did fine academically. I am pretty successful. If I had gone to a top notch private school I probably would have got a couple more A grades and while I got 3 Cs at GCSE in my state school at least 2 of these might have been Bs (no school or teacher could have got me any better than a C in maths because I hated it). I almost certainly would have got a better grade at A Level in 2 subjects too. However, my GCSE and A Level grades were good anyway and I don't think if they'd been marginally better it would have made any real difference to my life. Even if I had gone to a top notch private school I probably would have still been a teacher and would be happy with teaching as I am now.
But I am sure I would not have had to endure daily bullying for being weird, swotty, a 'snob' and so on which mainly involved name calling and being spat on as I got off the school bus (treatment to be fair which was doled out to everyone and not just those who wanted to do well). I am quite sure that I wouldn't have been bored to death in English lessons as I had to listen to incredibly boring and basic texts being stumbled over in the class while I was reading Jane Austen at home. I think increasingly that I would have been encouraged to have been a more confident and articulate speaker and I actually think increasingly that the legacy of my comprehensive education means that I am still shy in discussion.
And this is why I chose private education for my kids. Not cos of academic results, not even because of small class sizes or extra curricular activities or any of the other many advantages which it gives them but because I personally think there is a much greater likelihood that they will be happy there and be able to develop to the best of their ability academically and socially. I want them to be happy at school first and foremost and then challenged and supported secondly.
For me those things are probably the second most important thing I can give to my kids after my own love and support for them (which is a given and a constant). And for me that's worth making all kinds of sacrifices for.