John Bercow, the former Tory MP and Speaker of the House of Commons, has delivered an extraordinary broadside against Boris Johnson and the Conservative party as he announces he has switched his political allegiance to Labour.

In an explosive interview with the Observer, Bercow says he regards today’s Conservative party as “reactionary, populist, nationalistic and sometimes even xenophobic”.

Bercow, who stepped down as Speaker in 2019 after 10 years, says he joined the Labour party a few weeks ago because