Economic policy is so fraught that Burnham must choose from various paths. Retaining Reeves means warmed-over Starmerism; Miliband would be a sign that the Labour Party is tacking left; and choosing Streeting would be an advertisement that the Blairites were getting the band back together. What signal will the next Prime Minister seek to send?

Critics point to Miliband's Net Zero fanaticism as reason enough to keep him away from No 11. But that misses the bigger picture.

The frontrunner to become Britain's next prime minister, Andy Burnham, plans to lay out his economic agenda on Monday, in his first major policy announcement since Keir Starmer…