I think that parents of privately educatied child should apply to their LEA for a state place for all their children just as the new government take over.
They can do this whether they intend to move children or not. It would be an ideal opportunity to see just how well the system copes. Although it is a relatively small number of pupils it may cause just enough disruption to make the idea fade away.
For some rural schools like our local senior school they would seriously struggle to accommodate the number of children in their catchment that currently go to private schools.
There are 3 large independent day schools locally and along with their feeder schools you would be looking at in the region of 5000 pupils looking for places in a relatively small number of schools.
I know that this would be theoretical, because not all pupils would be entered into the state system, but for this purpose if 50% changed and a couple of the schools had to close, going forward, several new state schools would be needed locally.
Converting existing private schools to state is a logistic nightmare since the buildings are often historic and grade 2 listed with high maintenance bills. They are not at the disposal of the LEA so cannot be sold off to pay for new buildings and would have to be leased.
I think that Labour really need to do some joined up thinking around this plan and really think about the consequences. The amount of money they will potentially earn could be quickly swallowed up by a huge budget required to accommodate a sudden increase in state pupils.
But then we know that some politicians seem to struggle calculating taxes and expenses so it comes as no surprise that they haven’t done their sums.