Because we all know the private schools are head and shoulders above the vast majority of state schools. If state schools were any good people wouldn't be paying £12-15k a year (or more) to send their kids to private schools. The best teachers are going to private schools where class sizes are much smaller, and facilities much better. The under-investment in state schools gives us class sizes of 60+, struggling to find half-decent teachers because the wages and conditions in state schools are abysmal. And schools crowd-funding and begging parents for voluntary donations. None of this being the fault of private schools. All of this being the fault of austerity-driven cost-cutting and lack of investment by our delightful Tory government.