Why didn’t Boris Johnson sack Matt Hancock last Friday after his energetic clinch with Gina Coladangelo — in blatant contravention of government regulations — came to light? Given his own rackety private life over the past two decades, the Prime Minister may have felt he couldn’t fire Mr Hancock without being accused of hypocrisy. He has long maintained that what politicians do in private is entirely their own business. Boris didn’t want to risk undermining this self-serving thesis by giving the heave-ho to the philandering cabinet minister. But the main charge against the now former Health Secretary wasn’t that he had betrayed his wife of 15 years, whom he has now brutally dumped, but that he had flouted regulations he had applied with officious zeal.