Very interesting topic.
I'm somewhat against private school education, simply because grades ought to be an indicator of intelligence and effort. It seems that if daddy's rich enough, they can get A grades without having to do as much work. My next door neighbour at Oxford went to Westminster School (2nd in the country, £19,000 tuition fees a year!), and said himself that if he'd had gone to state school he would have got CCC. He just came bottom in the whole uni for Chemistry prelims (1st yr exams).
I just feel that if ur good enough to be at Oxford, you should have no probs getting AAA from a state school. I don't understand why ppl still fork out up to £20,000 a year to get 3 A grades which they should be capable of getting at a crap school. If they're not capable of that then they shouldn't be at Oxford! Yeah I know at a gd private school you get opportunities like debating, rowing, swimming...but it still ain't worth the extra cash.
However, to contradict my argument, the people from Eton at Oxford tend to do bloody brilliantly. And in History mods (1st yr exams), 5 of the 6 boys from Radley got a 1st.