The legacy of Boris Johnson will likely prove as contested as his Premiership. While his detractors will damn him, his supporters will stay loyal. Five weeks since his implosion, his most lasting contribution is arguably best summarised by his infamous comment that ‘when it comes to cake, I’m pro having it and pro eating it too’. Three weeks before his successor is announced, as summarised recently by Robert Shrimsley in The Financial Times, it’s clear that Johnsonian cakeism is now the dominant philosophy of the Tory Party: “While Conservatives may have tired of Johnson’s personal failings there is less evidence,…