Interesting. From that article:
In a statement the Department for Education said that the policy "will raise £1.8 billion a year by 2029/30 and that just 0.1% of pupils will be switching from private to state schools"
Where to start? That the date is in the next term of government?!
Or that they can't do maths and/or are clueless about impacts (OK, we know that already!) when they say that only 0.1% of pupils will switch. That would be only 1.5% of the 7% of chuldren who are at private school switching. They had previously predicted 3-5%. And it's blindingly obvious that it will be more.
Or are they lying through pedantry? In 2029/2030 - 5 years after the introduced the new tax - only 2/7 of the children who were in private schools when it was introduced won't have moved anyway to the next stage of education. So if the children in the younger years just didn't start private school (when they would have otherwise) then they aren't strictly switching. Although the financial impact is the same for the state. Ie if 10% of those who would have gone private, instead choose state then the policy loses money every year.
Actually it's probably that last point, since 2/7 of 5% they said would migrate actually comes to the number they gave (1.5% of the 7%, which is 0.1% of all students)
So it looks like Labour are deliberately obfuscating the truth that the policy will lose money, through trickery and hoping that people can't do maths... as well as being incompetent by also underestimating the numbers who will migrate (it will be higher than 5%)... and also evading responsibility by pushing the date outside their term in office.
Pretty much what we would expect from Labour.