@aa if I may say you've fallen into the trap of suggesting that the extra funding required to educate the private school kids would come from an adjustment to the tax system, the good old tax the rich (ie not me).
As you know I've spent most of the last year in France where all the best schools are state run, there is the small matter that taxes for everyone are in the 40% range (at least). Make no mistake I'd love to see a top notch state system with class sizes capped at 25 but I cannot see us getting there. When the Labour party significantly increased funding for the NHS the staff took most of it in wages, good for them but no benefit for the patients.
The Self Employed. Be. Very careful about trying to interpret these stats. Being self employed gives you big tax advantages, extreme example being Greece where most Doctors are self employed so they can fiddle every which way. Set that against the fact that many people can't find traditional work so they go self employed. It's a hard one to decipher.