The arguments from private school parents are so self-serving.
The main one that they really care about (but won’t write down) is that they don’t want to pay it and it might cost some skiing holidays (or delay a house extension, or reduce meals out from twice to once a week).
The ones you will see lots of though are:
It will add strain to the state sector-not really true as schools will welcome the extra funding. And, most importantly, they never even gave the state sector a moment’s thought before now, except to avoid it like the plague.
It will make the private sector ‘even more exclusive’- true, but we passed the point when it was accessible to the traditional middle classes many years ago. That ship has long sailed.
The state sector should ‘just level up’- this one is really offensive. The state sector work very hard to overcome a severe lack of funds and a severe lack of basic parenting skills.
It is ‘the politics of envy’- said about every single tax which affects only the wealthy. It might be true, it might not. It is a bit of a Labour dog whistle. But that doesn’t make it unfair or wrong.
I do think it is unfair to suddenly introduce it, and I suspect and hope that they may phase it in or delay it. Schools should have a proper chance to prepare (after they know for a fact it is happening), and pupils education shouldn’t be disrupted. But, as the vast majority of private school parents know, pupils leave every single year due to family circumstances changing. Divorce, businesses going under and redundancy can all lead to a pupil being forced to change to the state sector. That is the downside of private schooling; if you can no longer afford it, it impacts your children’s education.