Prime Minister Sir Keir Starmer “will not walk away” after Andy Burnham said he will challenge him for the Labour leadership if he wins the Makerfield by-election. Downing Street said the process for challenging the Labour leader “has not been triggered”, and that the country expects ministers to “focus on governing”. The Greater Manchester Mayor – widely viewed as Sir Keir’s main rival – has previously promised a vote for him in Makerfield would be a vote to “change Labour” but had not explicitly said he would launch a bid until pressed on the BBC’s Question Time by-election special. Appearing...