Those in the know say he's "the ultimate keeper of secrets" - Simon Case was announced this week as the new Cabinet Secretary and head of the Civil Service. Aged just 41 and with a CV that takes him from GCHQ to Kensington Palace, he's now set to take on a role at the heart of government, heading up a workforce of more than 400,000 people. But with Covid an ongoing problem and Brexit on the cards - and without any experience of running a department - has the so-called "Rolls Royce of Sir Humphreys" got what it takes?

Presenter: Mark Coles Producers: Ben Crighton & Beth Sagar-Fenton Editor: Penny Murphy