Meet Theresa May's Brexit nemesis: UK Parliament Speaker John Bercow

Bercow, 56, is the most controversial Speaker of the House of Commons in recent memory -- and he’s a crucial figure influencing the UK’s divorce from the European Union. He voted to remain in the EU in the 2016 referendum and has a reputation for giving rank-and-file members of Parliament time and influence during key debates.

Brexit has thrown up all kinds of obscure questions of Parliamentary procedure on which the Speaker must make the final ruling. Since May lost her Commons majority in 2017, and now runs a weak minority government, ordinary members of Parliament and the Speaker have considerable