YouGov’s latest polling shows a collapse in support for Labour and the Tories, stagnation for Reform… and historic highs for the Green Party.

It's not just Farage's Reform on the right giving Labour the jitters; Zack Polanski's Greens on the left have doubled their support. But it would be a disaster if the PM drove the party in their direction to appeal to old-school Labour voters, warns John Rentoul