Editorial: Keir Starmer won power but never explained Britain’s crisis. The new MP for Makerfield offers a sharper diagnosis – and one that voters can understand

The prime minister is facing an imminent challenge from Andy Burnham, fresh off his Makerfield election victory.

For his Labour critics, Andy Burnham is just Keir Starmer in a black T-shirt. They mutter that the new MP for Makerfield lacks substance and would be quickly found out as PM.…