Liz Truss has been appointed the new Prime Minister and as she made her way to Balmoral to be invited by the Queen to form a new government, Matt Chorley finds out what happened when previous Prime Ministers kissed hands. Featuring historians Hugo Vickers and Sir Anthony Seldon and David Cameron's Deputy Chief of Staff, Baroness Kate Fall. 

Plus Finkelvitch on Boris Johnson's farewell speech and legacy.

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