Why did the election polls overstate Labour’s lead?

Surveys consistently showed a landslide for Starmer's party, but predictions were wide of the mark

A low turnout, difficulties in polling ethnic minority voters, a surge in tactical voting and a late swing to the Greens are being examined by pollsters, after an election campaign in which Labour's vote share was widely overstated in the polls.

It was perhaps the most polled election in British political history, with surveys consistently showing a Labour landslide and devastating losses for the Conservatives. While that is the overall result voters delivered on 4 July, Labour secured a lower vote share than polls had predicted.