Regarding staff, many private schools are overstaffed. I am not talking about excellent quality maths teachers, but admin staff, multiple languages & sports offered - that kind of thing. That will have to go in some cases. It is sad for modern languages, for example, but needs must. Less choices does not necessarily make for a lesser education in all cases.
All the research shows that at secondary school in a selective environment 20 vs 26 in a class makes no difference. The teacher just has to mark a bit more. If you have better paid better quality experienced staff that actually can pay off.
Maintenance of facilities is hugely expensive and that has to be addressed, of course. However, state schools cope with not repainting every second term etc , maybe private schools will have to cut back a little bit. Allow packed lunches more etc.
Energy costs have gone up a lot but teens tend to be too hot anyway. If you have more kids in the classroom and smaller classrooms you actually need to heat less…
I just think the private schools are going to have to do what the state schools have had to do and get their act in gear.
Moreover, keeping the middle class parents and the teachers’ and doctors’ kids there is really important because they tend to add to the high grades and keep the standards up.
London, in particular, has a lot of working professional parents paying school fees and has a lot of international parents from Asian background as well that push their kids. It is in the interest of schools to keep those kids and parent groups as they tend to be high achieving. Obviously that is a vast generalisation - but keeping the hardworking aspirational parent group in your school and their kids is vital to future success.
Private schools in UK really need to avoid just attracting rich kids because that is what has happened in many other countries and academic standards fell greatly as a result. No matter how good the school and teaching the child needs to have a high IQ and supportive parent to achieve well, typically.