Private schools are of immense benefit to a certain type of child so should not be banned. While genuinely bright kids will excel at any crappy school and waltz into the university of their choice with minimal effort, those who are a little slow on the uptake and can't excel on merit alone will benefit from private education. Granted, despite having tens of thousands of pounds on them, the majority of privately educated kids will still fail to meet their parents expectations of getting into Oxbridge but, hey, you can only polish a turd so much.