Andy Burnham has said tired British politics "needs a new script" as he told voters in a critical by-election that backing him is "a vote to change Labour ". The Greater Manchester Mayor, who has long harboured leadership ambitions, launched his campaign to be MP for Makerfield on Friday, with a thinly veiled pitch for the keys to Downing Street. While he pledged to stick to Labour's manifesto commitments, he said there was room to be "more radical" within its confines. Mr Burnham dismissed