Book excerpt: When Bercow retired as Speaker of the House of Commons on 31st October, he had become one of the most recognisable and iconoclastic figures in British politics, and had created a vacancy of huge importance. As Speaker since 2009 he had a ringside seat during one of the most febrile periods in modern British history, presiding over the Commons while it had to contend with key issues such as austerity in the light of the financial crisis; the coalition government between the Conservatives and Liberal Democrats; and of course the most intractable problem of all, how to deliver on the 2016 referendum decision that Britain should leave the EU.