From what I can gather most of them don't send their children to them either.
Yet despite this disadvantage, most of them are experts on the subject of education - a fact widely-acknowledged amongst teachers.
If this isn't testimony to the superiority of the private system, I don't know what is.
Plus not all of them went private. David Aaronovitch, for example, spent some of his youth in a comp. That's why his views on education are just so damn sharp. Generally anything he writes on the subject is taken very seriously in staffrooms up and down the country. We only wish he would write more.
Vote meritocracy - vote Labour.