I think it differs from school to school. some schools have done a huge amount, which massive outreach programs. Other schools have done nothing.
Our school has several full bursaries. And deposits are refundable when the pupil leaves (not if a place not is taken up). It was this deposit which, when their DCs left, many parents donated to fund these bursaries. Very few donated this year.
I think it is wrong to describe it as “going to war” by the schools. I fear it will just be a “cost cutting” exercise where instead of sharing the facilities, schools will rent them out, instead out outreach programs, they charge for course (to be paid by aspirational state parents) instead of asking parents to donate to bursaries, they ask money to keep costs down.
It doesn’t matter to us anyway, we are going to switch to state. And, we can pay for courses, extras and use of facilities.
However, I used to volunteer with mentoring /tutoring a few children in state school (homework planning, interview practice, targeted help). I am going to stop and spend that time with my own children. It was something I did to give back - I see less reason to do that now.
I really, really hope that these extra teachers materialise, that is is used for state schools and that this doesn’t damage really good relationships between state schools and private schools. But I am not that hopeful. The glee of some posters at the thought of children switching to state is awful - hardly something which encourages those parents to continue lobbying for increased state support.