„On average, the fee income from families with children in private day schools exceeds the government expenditure on state schools by a factor of around 2.5 or more, depending on the education stage. When supplemented by private schools’ physical and financial wealth, the per-pupil resource gap becomes at least three. With these resources, British private schools can specialise in small class sizes, with a pupil-teacher ratio of less than half that of state-maintained schools in 2016.“
Dr. Golo Henseke u. a., Income, housing wealth, and private school access in Britain. In: Education Economics, 29:3 (2021), S. 254.