Vernon Bogdanor, a professor of government at Oxford University, reckons that Mr Bercow is vulnerable.

ECONOMIST: The campaign in Buckingham

Vernon Bogdanor, of Oxford University, argues that the decline of party allegiance has also increased the appeal of a non-partisan head of state.

ECONOMIST: Why the monarchy is stronger today than ten years ago

Britain is a highly centralised state more so, in the view of Vernon Bogdanor, of Oxford University, even than France, the paradigm of centralised government.

ECONOMIST: Britain