Only 7% of members of the public attended a private school. But 71% of senior judges, 62% of senior officers in the armed forces, 55% of permanent secretaries in Whitehall, 53% of senior diplomats, 50% of members of the House of Lords and 45% of public body chairs did so. So too did 44% of people on the Sunday Times Rich List, 43% of newspaper columnists, 36% of cabinet ministers, 33% of MPs, 26% of BBC executives and 22% of shadow cabinet ministers.
Oxbridge graduates also have a stranglehold on top jobs. They comprise less than 1% of the public as a whole, but 75% of senior judges, 59% of cabinet ministers, 57% of permanent secretaries, 50% of diplomats, 47% of newspaper columnists, 44% of public body chairs, 38% of members of the House of Lords, 33% of BBC executives, 33% of shadow cabinet ministers, 24% of MPs and 12% of those on the Sunday Times Rich List.
Source: http://www.theguardian.com/society/2014/aug/28/closed-shop-deepy-elitist-britain