For decades the holy grail of election night has been swing - the method of comparing support for the parties between general elections invented back in 1955. Matt finds out what kind of swing Keir Starmer needs to get a majority in the Commons and remembers the 'sultan of swing', David Butler, with expert voices in including David Dimbleby, Jeremy Vine, Jon Snow and James Kanagasooriam.

Plus: Libby Purves and Rachel Sylvester talk about politics on both sides of the channel after that extraordinary result in France, and asks are there similarities between Nigel Farage and Jeremy Corbyn?

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