Andy Burnham (Labour) won the Makerfield by-election on Friday with a decisive majority [1].

The victory creates a potential power struggle within the Labour Party, as Burnham's strong performance intensifies pressure on Prime Minister Keir Starmer.

Burnham secured 55% of the vote [1]. He won the seat with a margin of more than 20 points over his opponent from the Reform party [1]. The results from the 2026 by-election have prompted immediate discussions regarding a leadership crisis within the party [2].

Sources close to Burnham described the current political climate as "brutal" and said it is "very unlikely" that Starmer could win a leadership contest [1]. The landslide victory in Makerfield provides Burnham with significant political momentum to potentially challenge the incumbent leader.

Prime Minister Keir Starmer responded to the result by addressing the possibility of a party challenge. "I will stand in any leadership contest," Starmer said [3].

Despite the Prime Minister's stance, party members and rivals suggest that a formal challenge may follow this result [3]. The scale of the win in the UK constituency has shifted the internal dynamics of the Labour Party, turning a local victory into a national question of leadership stability.

Andy Burnham secured 55% of the vote.

The Makerfield result transforms Andy Burnham from a regional figure into a direct threat to Keir Starmer's leadership. By securing a double-digit margin over a Reform opponent, Burnham has demonstrated a level of electoral appeal that may embolden dissatisfied Labour MPs to trigger a formal leadership review, potentially destabilizing the current government's internal cohesion.