ANDREW PIERCE: They were the ultimate political dream team. So how the hell did it come to this?
On his final day in Downing Street last November — before a stage-managed exit through the front door of No. 10 timed for the evening TV bulletins — Dominic Cummings spent a convivial hour with Boris Johnson in his study. Over a pot of tea and digestive biscuits, the two men talked about their extraordinary successes, the 2016 Brexit referendum and the 2019 election landslide. They shared their mutual regret that they hadn’t been able to sustain their productive working relationship for longer in government. When the meeting ended, the Prime Minister promised Cummings they would stay...