Let me just reiterate once more:
I (and many mumsnetters) have no objection to other people having done well in life and choosing to spend their money on their children's education. We just find it hard to feel sorry for the financial struggles of people who are clearly, by our standards, rather well off. That is why we take objection to the very common article in the national press, which is all about inviting you to commiserate with people who seem remarkably well off. Personally, I am not asking anyone to feel sorry for me either: I enjoy life and don't equate money with success, so clearly I do not deserve any pity on that score. But I do know many hardworking people who through no fault of their own are struggling with everyday necessaries, and it's to them my sympathy would go. A lot of these people do jobs that our lives depend on, but which happen to be badly paid, so I would feel very uncomfortable about suggesting that it's their own fault for not getting a better job.
The suggestion that a 7yo with a reading age of 12 can only thrive with special schooling is plainly ridiculous. There is nothing that unusual about having a reading age of 12- I had that in two languages by that age and was teaching myself a third language at home. I would never have thought that entitled me to behave badly at school.
My dd also has a very advanced reading age (was reading Lord of the Rings at age 6), but I never doubted that I could teach her to behave. You don't have to behave badly just because you're bored. Also, if you have interesting things to do out of school, you will be less bored and a little adapting to other people's needs during school hours is unlikely to do you much harm.
Obviously, there are very gifted children who also have behavioural problems, but I think it is totally wrong to expect behavioural problems just because your child is gifted. Heaven knows there are enough untalented children with behavioural problems. And plenty of gifted children who also have the gift of understanding the needs of others, the significance of rules and the importance of tolerance. Academically doesn't have to spell emotionally immature.