I’m assuming you missed the recorded interview where the Director of the IFS referred to it as a tiny, tiny amount of money.
”in the context of how much we raise from taxes in general, which is more like a trillion, this is a tiny, tiny amount of money.” He also said “But don't be fooled into thinking this is going to make any real difference to the amount of money available for public services.”
The IFS predicted that only 3-7% of pupils would leave the private sector. 3% left last year alone, so that assumption is already on shaky ground.
Lord Winston is a private school advocate, and spends a lot of his time visiting them.It's hardly suprising he's against it.
He visits private schools as part of an outreach programme where private schools work closely with the state sector.
Robert Winston in House of Lords debate :
“What we are doing with the outreach at Imperial is using the private schools. To take one example, Peterborough is a pretty poor area. Lots of state schools there are not doing very well. We focused on Oundle, which is in the centre up there. Oundle has been amazing. I have visited Oundle maybe seven times in the last 10 years, maybe more. Other members of the college have gone there too. They have connected with the state sector and made a huge difference to the state schools in that collaboration. Those sorts of collaborations are what we should have done in the health service under Tony Blair’s Government, bringing the private sector into the health service, but he felt that the party would never stand for it. We now have another opportunity with education; we have to consider how we can manage that. The attitude of damning the private sector, with all the objections that we have heard—and I agree with them completely; they are really serious—needs to change.”
Lord Winston is not a “private school advocate”. He is an extremely well educated and intelligent man who can see the benefits that the sector can bring.