Tom Dawson has been headmaster of Sunningdale School, in Berkshire, since 2005. It has 110 boys aged from eight to 13 and feeds major public schools. It celebrates its 150th anniversary next year; Dawson’s family bought it in 1967. Its alumni include Prince Michael of Kent, Henry Blofeld and the late Bamber Gascoigne. Now, like all independent schools, it faces jeopardy.