Can Rishi Sunak hold his party together, or is former deputy chairman Lee Anderson's departure a sign of even more Tory unrest ahead?

The political masterminds Peter Mandelson, Polly Mackenzie and Daniel Finkelstein join Matt Chorley to look at what happens when politicians defect, from the Gang of Four to Change UK. And how did Keir Starmer react to Peter's diet advice?

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