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It's Britain's top civil servant this week: Sir Mark Sedwill, Cabinet Secretary and the UK’s National Security Adviser. He's the first person to juggle both roles at the same time. And - what with Brexit, a new PM, perhaps even a looming constitutional crisis - he's doing it at a time of serious uncertainty. So: who is he?Presenter: Mark Coles Producer: Ben Crighton

Joshua Wong has gone from schoolboy protester to the face of the pro-democracy movement in Hong Kong - a passionate defender of the territory’s right to self determination. He’s been repeatedly arrested and jailed. Now this week - fresh out of prison - the 22-year-old Wong is back in the limelight, putting himself on a collision course with the authorities in mainland China.

Jo Swinson is the bookies favourite to win the Liberal Democrat leadership race and take over from Vince Cable. But can this 'millennial' politician from a suburb of Glasgow, be the woman who takes the Liberal Democrats to election victory?