The clue, as Sherlock Holmes taught us, is “the dog that didn’t bark in the night”. This week was the fourth anniversary of “getting Brexit done” when the UK finally left the EU. Yet from the Government came not a bark, scarcely a growl – except from the Business and Trade Secretary, Kemi Badenoch, who published an excellent 24-page summary of the fruits of Brexit. The rest of the government machine was mysteriously silent.