Labour must cease taking progressive voters for granted, says Sadiq Khan

London mayor criticises PM for calling Greens extreme' after Gorton and Denton loss, saying it is a flawed strategy'

• Sadiq Khan: Labour must stop channelling Reform and unite with progressives. That's the byelection's lesson'

The mayor of London has said the Gorton and Denton byelection has exposed a far-reaching change and fracturing" in UK politics and Labour must ditch its flawed strategy" of taking liberal progressives for granted.

In what appears to be an attack on Keir Starmer, Sadiq Khan challenged the prime minister's branding of the Green party and its policies as extreme", saying many of its supporters shared Labour's values but were disappointed in the government.