Britain's outgoing Prime Minister David Cameron leaves 10 Downing Street in central London, on July 13, 2016, as he prepares to address his last Prime Minister's Question Time at the House of Commons. Theresa May will become Britain's second ever female prime minister on Wednesday July 13, 2016, when David Cameron steps down after a seismic referendum to leave the European Union that sent shockwaves round the world and wrecked his career. / AFP / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
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