I look at my DDs grammar schools and notice many of the parents driving mid range Mercedes and Bmw and Volvo's. Whereas The private school families can be seen to picking up their kids in thier 'Betaganya's and Cayanne's ' (Bentley's and Porsche's).
This is a culture and wealth difference that has developed over the last 30 years or so . I can remember my father having an aforementioned Bmw 7 Series.
This was the 'best car' at my grammar school and was equal to what my friends families with children at private schools had.
It seems today that £60k cars are the norm of grammar schools and £150k cars are normal at private schools.
This i think explains why Private schools have become the domain of the Wealthy. Private schools have removed if not by fees than socially even the offspring of Doctors ,Accountants and other professional people.
30 years ago were able to attend Private schools because their mother took a part time job up to pay the fees.
This is no longer available !