It's a lot more than 7% of children that this impacts as this is impacted by a lot of children using state school while younger - 18% of children by 16 are in private school and families which plan to move their children to independent school in the future are also unlikely to be keen on this policy.
That is a lot of families (and clearly not just the most wealthy) - it's also possible others involved with the school such as staff would not want to vote for this policy as it could impact job security, payrise possibilities ect.
There are also a lot of families which have one child in independent school and other(s) in state school.
"There are around 2,600 independent schools in the UK,[2] which educate around 615,000 children, some 7 per cent of all British school-age children and 18 per cent of pupils over the age of 16"
I am hopeful that as the election comes nearer this is a bigger issues because at this point it's easy to suggest you would vote labour based on wider policy but this will have a big negative impact on so many families and schools.
It feels like the intention behind it was to try and cause a divide in the population and therefore win votes on one side - the problem is the lack of opportunities in state schools and this policy does nothing to improve that for anyone but tries to suggest to parents that other parents who may use independent schools are to blame.
Nothing else similar has VAT on - VAT is not charged on sports, tutors, books, education (and sooo many other exempt categories such as Gambling and Antiques ect) Not everyone can afford any of these things does that mean VAT should be added.. no . VAT isn't made to try and redistribute wealth because the type of education is seen as expensive anything within a category would be the same rate - income tax, inheritance tax, benefits ect do this. It's misleading to suggest schools are getting a "tax break".
There are some children in independent schools which will have had more sports lessons, drama lessons ect - if as a result of this they go onto the state secondary schools I expect they will end up taking a higher % of the places on sports teams, main parts in the school play, places in the top sets and it will lead to less opportunities all round, I can't see it will realistically make any money in fact it will probably cost money, and remove choices for parents, and make our education system in the UK less competitive globally.
Hopefully the policy gets dropped or somehow labour do not get in..