The Green Party is preparing to aggressively target Andy Burnham from the left if he is allowed to stand in a future Manchester by-election, according to party sources — a move that would set up one of the most watched constituency battles in recent British political history.
Green sources have told journalists the party would “throw the kitchen sink” at any seat where Burnham stands, framing the Greater Manchester Mayor as part of the Labour establishment and positioning themselves as the authentic progressive alternative. The strategy builds directly on their stunning victory in the Gorton and Denton by-election in February 2026, when Green candidate Hannah Spencer won the seat with a major swing, pushing Labour into third place behind Reform UK — marking the party’s first Westminster by-election win.
That contest was itself triggered by the resignation of Andrew Gwynne, and was overshadowed by Labour’s National Executive Committee, backed by Sir Keir Starmer, blocking Burnham from standing as the Labour candidate. The party cited the cost and disruption of simultaneously holding a Greater Manchester mayoral by-election, but the decision fuelled fierce perceptions of Labour infighting and a leadership disconnected from its own voter base.
The Greens are acutely aware that Burnham presents a more formidable target than most. He has previously defeated Green candidates in mayoral races by substantial margins and commands genuine popularity across Greater Manchester. However, party sources believe the political landscape has shifted sufficiently in their favour — pointing to their Gorton and Denton template of flooding a seat with resources and activists while positioning themselves as the credible left-wing option against both Labour and Reform UK.
No by-election has been formally triggered for such a contest, and Burnham has not confirmed any plans to seek a parliamentary seat. Speculation persists, however, about whether he might seek a route back to Westminster amid growing pressure on Starmer’s leadership — pressure that Burnham himself has not sought to dampen. He previously lost a parliamentary selection contest to a left challenger in 2015, a detail Green strategists are unlikely to have overlooked.
The New Statesman’s Megan Kenyon has reported on the Greens’ intentions, highlighting how the party is increasingly confident that the fractures in Labour’s base — exposed most visibly in Greater Manchester — represent a durable opportunity rather than a temporary blip. Whether Burnham ultimately stands will determine whether that confidence is put to the test.
