Nicola Sturgeon and Alex Salmond were once close allies and friends, but then the relationship turned sour, with the battle going all the way to the courts and to the heart of the question about whether the United Kingdom will follow their friendship in being broken up. 

Matt Chorley is joined by Keiran Andrews, Scottish political editor of The Times, to explain the row. Professor James Mitchell from Edinburgh University and journalist Angela Haggarty assess the impact on the SNP; and Luke Graham, former head of Boris Johnson's Union Unit, on turmoil in the Tory camp.

PLUS: Finkelvitch: Daniel Finkelstein and David Aaronovitch on political retreads, and Trump's comeback.

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