MumTryingHerBest here's an example:
Tiffin Girls:
Income:
Donations: £30k
Facilities: £120k
Trips & Catering: £462k
DFE general grants: £4822k
Capital grants: £360k
So if you exclude the trips & catering you get £5.322m
Money was spent:
Staff: £3.771m on 55 teachers, 37 support staff, 7 management
Educational supplies: £156k
Trips: £281k
Exam fees: £99k
Training: £18k
Other direct costs: £73k
Maintenance: £635k
Depreciation: £413k
Cleaning: £56k
Catering: £96k
Other support costs: £160k
Bank charges: £2k
Technology: £5k
Recruitment and support: £40k
Rent and rates: £34k
Insurance: £41k
Spending: £5.456m + depreciation = £5.869m
They have 892 girls, so spending comes to £6,579/pupil.
Then Kingston Grammar, which is in the same area, fee-paying, not particularly rich, 812 pupils:
Income:
£11.543m net of £1.081m in bursaries&scholarships
Catering: £286k
Registration (fees?): £89k
Donations: £273k
Rent & trading income: £137k
Expenditure:
Staff - £7.443m on 104 teachers & Technicians, 30 premises staff, 28 admin staff, 1 nurse
Other expenditure came to £3.011m (which isn't broken down particularly clearly), plus £773k depreciation, for a total of £11.227m
So they spent £13,826 per pupil. Their fees are £16,605/year. Lunches £705/year.
So the expenditure is pretty much double for a typical London day school compared with a London grammar school.
Outside of the southeast, spending per pupil is probably closer to £10k for private schools.