Boris Johnson became the UK Prime Minister on Wednesday after winning a long Conservative Party leadership race. With that rarity in both politics and showbusiness, Mr Johnson takes over from Theresa May to steer Britain's exit from Europe at a time of uncertainty and divisive politics. Tim Marshall charts Mr Johnson's newspaper and political career and poses why an Eton-educated man with an upper-class accent resonates with so many parts of the country. Watch the latest edition of Sightline above.