Of the 15 Old Etonians in the Commons, all but two serve on the Conservative benches.

BBC: NEWS | UK | Education | Third of MPs privately schooled

Two top jobs, chairman of Lloyd's of London and private secretary to the queen, are held by Etonians (respectively, David Coleridge and Sir Robert Fellowes) who list no other education.

ECONOMIST: From the archive

Yes, some people hate Etonians and bankers.

ECONOMIST: Bagehot

Of course, Mr Letwin and Mr Cameron, both old Etonians, may simply be attempting to put some clear blue water between themselves and the more populist - or wilfully philistine depending on your point of view - elements on Labour's front bench.

BBC: David Cameron