The great and the not-so-good of the international conservative movement have descended on Wisconsin this week. Liz Truss and Nigel Farage are among the Brits jetting in to toast President Trump’s formal nomination at the Republican National Convention. But what of the man they once called ‘Britain’s Trump?’ Boris Johnson yesterday made a rather low-key appearance at the conference, appearing at vaping panel that was remarkable only for its poor turn-out.