I’m no Westminster insider, but there comes a point when you have to consider that perhaps Carrie Johnson was right about Dominic Cummings. That point for me arrived in May last year when, without giving any indication he might be the one at fault, Cummings unblinkingly described to a parliamentary committee his relationship with his former boss, Carrie’s husband the British Prime Minister:

‘The heart of the problem was, fundamentally, I regarded him as unfit for the job and I was trying to create a structure around him to try and stop what I thought were extremely bad decisions, and to...