A week after Keir Starmer announced his resignation, YouGov polling showed Labour up two points and the Greens down by the same margin. The shift has prompted questions about whether an Andy Burnham premiership could reshape support for Zack Polanski's party.
The Greens had attracted voters disillusioned with Starmer's Labour. But Polanski's party now fears the affable, left-leaning Burnham could win them back. The dynamic comes amid unprecedented political volatility.
This year alone, a five-point Labour lead over the Greens has swung to a similar margin in favour of the Greens, then to a seven-point advantage for Labour. The seesawing poll numbers make any prediction difficult.
For the Greens, the challenge is holding onto gains made during Labour's internal turmoil. Burnham's potential appeal to progressive voters could narrow their path to further growth. The party may need to sharpen its distinct policy positions.
Experts caution it is too early to gauge the full impact, particularly given the rapid shifts in voter sentiment that have characterized recent British politics.