“My point is that presumably there is a reason that these private school parents went to great expense to avoid putting their child in a state school, yet these reasons seem to evaporate when it comes to dodging an 'unfair tax'.”
it is a different concept if you are paying fees to pay for your own children’s teachers, maintenance/capex of facilities your child uses (even if the school does share them very widely) and don’t take a place your child is entitled to and already pay a huge amount of tax into a pot that gets shared with the many
VS
suddenly being told your choices are a “privilege” and you bought a luxury advantage so now your choices will be penalised with a privilege penalty, that buy the way won’t even help state schools anyway due to the pitiful amount likely to be raised (but the impact on you personally will be huge!)
So I think it is more than likely that many of those parents will reassess their choices, full stop. And unfortunately for the rest of us, not just with regard to schooling for their children, but with regard to having the privilege to work to that level etc to pay that amount of tax.
I think plenty of people will be making wide reaching changes off the back of this policy.
That is why taxes like this should always have a full impact assessment first. They are reckless against a backdrop of us simultaneously being told not enough people are working full time/full stop and not for long enough either.