Canterbury’s Rosie Duffield has set a record as the fastest MP to quit their party after an election, resigning from Labour with an excoriating letter to Prime Minister Sir Keir Starmer at the weekend. The reaction has been mixed, with some describing her stance as principled, while a former leader of the local party has described her as “the worst MP I have ever known”. So what happens now? And will there be a by-election? Reporter Daniel Esson explains… Why did Rosie Duffield quit Labour? On Saturday Ms Duffield, MP for Canterbury and Whitstable since 2017, left the Labour party. In a scathi…