How a contest to become PM is triggered, and Andy Burnham’s chances in the Makerfield byelection

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With Andy Burnham offered a path back to parliament, the chances of a Labour leadership challenge to Keir Starmer appear to have increased dramatically.

Manchester’s mayor said he wanted to return to Westminster to “make politics work properly for people” after Josh Simons, the Labour MP for Makerfield, said he would stand down so Burnham could run in the seat in north-west England.

Here we take a look at what might happen next.