Just a decade or so ago, most public‑school-educated parents felt obliged to give their children the same start in life they themselves were given — selling off heirlooms to send their Jacks and Henriettas off to Eton, Stowe, Cheltenham Ladies or St Paul’s. These days the price is just too high, says Andrew Halls, head of King’s College School in Wimbledon, and he’s been honest enough to name the cause: the hordes of prospective parents from other countries, oligarchs and oil men, all jostling for places for their progeny.