As he rambled through his final Prime Minister’s Questions in the House of Commons, Boris Johnson declared that it was “mission largely accomplished for now”. In that, Johnson revealed something of his true character. He has risen to the top because he went against convention. Rules were not for him and for a long time, many people in the UK responded to what they saw as his iconoclastic ways. But as Simon Kuper detailed in his book ‘Chums’, in many ways, Johnson was a deeply conventional product of his upbringing and class, who had considered rules as something other people…