In the Conservative leadership contest three years ago, Michael Gove reportedly told aides he’d taken cocaine. Now, he and five other contenders aiming for the highest office in the land have admitted to using illegal drugs in the past – from Dominic Raab’s university joint-smoking to Jeremy Hunt’s cannabis milkshake and Rory Stewart’s rather more unconventional use of opium puffing in the middle east. Boris Johnson got there first with an admission more than a decade ago that he’d tried cocaine and cannabis as a teenager, and it had no effect on him whatsoever.