But you realise Jane’s parents still pay the taxes for state education as well, and if she moves back into state the available money per child gets smaller because it’s then divided between more children? Is that fairer for the kid who’s already in state, or not?
Well it still remains to be seen how many children will actually move from private to state as a result of this policy. But either way, birth rates have dropped dramatically so there will be far fewer children coming through the system from now onwards. My children's primary school has gone from three to two form entry from reception this year, and this is also happening at schools across the city I live in. I'm sure this will have formed part of the government's planning for this policy.
Your post shows exactly the incoherence that this policy is based on. Simultaneously it’s “well Jane’s parents should just fork out as they can afford it anyway/well Jane’s parents shouldn’t have sent her then if they couldn’t afford the VAT so they deserve to move to state/well it won’t matter if Jane moves into state anyway because that’s fairer”. Either you want the policy to raise money or you don’t. Either you think more money for state kids is better or you would rather they all have less because it’s “fairer”. Or it won’t make any difference anyway. Which is it? Would you still support the policy even if it loses the taxpayer money while leaving the really wealthy untouched?
But it is such an arbitrary line that is being drawn here - based purely on what Jane's parents can/cannot afford. Plenty (I would hazard the majority) of her peers' parents will have no difficulty continuing to pay and some will decide (or have the decision thrust upon them) that they can't. Unfortunate for Jane, but policy decisions can't be made with an eye to the marginal cases like this.
For what it's worth I also think that the bog standard private schools will enjoy a bit of a bump in the next few years anyway, as inheritances from baby boomers start to flow down.