Andy Burnham won the Makerfield by-election on June 18, 2026, delivering Labour a parliamentary seat and clearing the path for the Greater Manchester mayor to mount a leadership challenge against Prime Minister Keir Starmer.
Burnham’s victory in the northwestern English constituency came after former Labour MP Josh Simons resigned from the seat in May to create the by-election opportunity. Simons, who won the seat in the 2024 general election, stepped down deliberately to allow Burnham—who had been forced out of Parliament in 2015—a chance to return to Westminster and pursue his long-stated ambition to challenge for the party’s leadership.
The by-election was held against a backdrop of deepening Labour discontent with Starmer’s government. Local elections in May had inflicted heavy losses on the party, with Labour losing all 22 seats it was defending in Wigan council elections to Reform UK. That collapse prompted Simons to act, and he publicly backed Burnham as the candidate most capable of rallying the party and voters disaffected by Starmer’s leadership.
According to the New Statesman, Burnham has already crossed the threshold of Labour MP nominations required to formally trigger a leadership contest. The exclusive report confirmed that three sources had verified Burnham held the necessary support from fellow MPs to force a leadership election, even before the by-election result was announced. This means Burnham can now formally challenge Starmer for control of the Labour Party and the prime ministership.
Burnham’s path to this moment was unconventional. As mayor of Greater Manchester since 2017, he had built a national profile as a vocal critic of the government. However, he could not mount a leadership challenge without a seat in Parliament. Simons’ decision to step aside was seen across Westminster as a calculated move to enable Burnham’s bid and potentially reshape Labour’s future at a moment when the party faced a crisis of confidence in its leader.
The by-election result represents a critical juncture for Labour. Starmer has warned Burnham against launching an immediate leadership challenge, signaling that he intends to resist any attempt to unseat him. But with the nominations already in place and a fresh parliamentary mandate, Burnham now has the formal standing and political momentum to pursue his challenge, setting up a direct confrontation over the party’s direction and the country’s leadership.
Sources
- The New York Times — Reported Burnham’s by-election victory and the opening it creates for a leadership challenge to Starmer.
- New Statesman — Exclusive reporting that Burnham has secured the nominations required to trigger a Labour leadership contest.
- The Guardian — Coverage of Simons’ resignation and Burnham’s candidacy; Starmer’s signal that he would offer Burnham a cabinet role if he won.
- Reuters — Reporting on the by-election context and Burnham’s stated intention to challenge for Labour leadership if he won.
- BBC — Live coverage of voting and the by-election result; reporting on Simons’ decision to stand down.
- LabourList — Confirmation of Simons’ resignation announcement and Burnham’s selection as Labour’s candidate.
