London's mayoralty explained

As Boris Johnson begins another four-year term as mayor of London, we take<br />a look at the powers he has at his disposal<br /><br />Subscribe NOW to The Economist: http://econ.st/1Fsu2Vj<br /><br />Get more The Economist<br />Follow us: https://twitter.com/TheEconomist<br />Like us: https://www.facebook.com/TheEconomist<br />View photos: https://instagram.com/theeconomist/<br /><br />The Economist videos give authoritative insight and opinion on international news, politics, business, finance, science, technology and the connections between them.