Its the opposite actually.
- Takes a long time to recruit and train teachers
- The capital infrastructure is falling apart due to a lack of investment
When UK demographics were normal, you could potentially fix this in 10 years or so.
But because UK demographics are poor (more retired people which are very costly and less working people that pay in), it will take a lot longer than 10 years.
So in the meantime, State schools will get measurably worse as they would have to absorb more children with limited funding.
I do this for a living (financial and economic long-term modelling), and just don't see that working. Too much investment into capital infrastructure (buildings) has been skimped by the Conservatives over the last 13 years, and there are too few teachers. You will have to spend much more over the next 5 years just to be standing still as many buildings are falling apart.
You are basically starting a marathon 10km behind the starting line.
The people banging on about making private schools pay more VAT don't see how large the problem truly is.
Their anger will in effect only hurt the middle class.
The wealthy will sit on the sidelines, paying a bit more for private school, and laugh.
You have to pick your battles when it comes to politics.
This really is not the hill to die on as it will just end up creating more Conservative voters.