As Andy Burnham returns to Parliament after winning the Makerfield by election, the Guardian's Rafael Behr joins the podcast team to discuss a huge week for British politics.

How should the prime minister - who insists he would compete in any leadership contest - respond? What does this period of volatility mean for how government works? And what would a prime minister Andy Burnham mean for the way Britain is governed? 

Hannah White presents.

With Giles Wilkes and Cath Haddon.

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