Now that John Bercow has announced his imminent departure, an inevitable political bun fight will surely follow. The outgoing Speaker told colleagues that he would be stepping down from his post by 31 October, the day the UK is supposed to leave the European Union. The move comes after the Business Secretary Andrea Leadsom told the Mail on Sunday that the Tories were planning to break with convention and field a candidate in his Buckingham constituency at the next election.