Andy Burnham’s emphatic victory in the Makerfield by-election on Thursday has intensified pressure on Prime Minister Keir Starmer to resign, sparking a potential leadership transition within the Labour Party. Burnham, the former mayor of Greater Manchester, secured the parliamentary seat with a commanding majority, bolstering his eligibility to launch a leadership challenge against Starmer.

Labour party rules require a challenger to secure the backing of 81 Labour MPs to trigger a formal contest. Burnham is believed to have met this threshold, positioning him to call on Starmer to step down and facilitate an orderly handover of power, potentially by September. Supporters of Burnham advocate for avoiding a protracted leadership battle, citing concerns that a divisive contest could harm the party's electoral prospects. Conversely, Starmer has insisted he will vigorously defend his leadership and remains committed to his mandate from the 2024 general election.

The party remains divided over the next steps. Some senior Labour figures, including former ministers and union leaders, have publicly urged Starmer to set a timetable for his departure, emphasizing the need for unity ahead of upcoming elections and to counter rising challenges from the populist Reform UK party led by Nigel Farage. Meanwhile, others within the Parliamentary Labour Party are wary of bypassing a leadership contest, warning that a coronation-style succession could undermine democratic legitimacy and leave the new leader without a clear mandate.

Wes Streeting, the former health secretary who resigned earlier this year, has indicated interest in standing for the leadership but may seek to negotiate his position with Burnham to avoid splitting the party. Some reports suggest Streeting could withdraw his leadership ambitions in exchange for a senior cabinet role under a Burnham premiership.

Burnham’s anticipated appointment of Ed Miliband as Chancellor of the Exchequer has sparked significant controversy inside and outside Labour. Miliband, currently Secretary of State for Energy Security and Net Zero, is a polarizing figure. Critics—including MPs, business leaders, and union representatives—warn that his high-tax and aggressive environmental policies could alienate voters and destabilize the economy, especially during a period of inflation and energy insecurity. Figures such as Labour MP Graham Stringer and Unite union leader Sharon Graham have voiced concerns that Miliband’s approach to climate policy risks damaging jobs and industrial growth, particularly in northern England’s traditional labour heartlands.

Opponents argue that Miliband’s track record on energy levies and his opposition to North Sea oil drilling have contributed to rising costs and economic uncertainty. Business leaders, including prominent financiers and chief executives, have expressed fears that his ideological stance may frighten markets and deter investment. Some urge Burnham to reconsider the appointment to avoid undermining his premiership from the outset.

Burnham’s supporters stress his intent to maintain fiscal discipline and continuity with existing economic rules, though his previous proposals have included significant reforms in taxation and nationalisation plans. His leadership bid is viewed by many within Labour as a necessary break from Starmer’s tenure, which has faced criticism for lacking clear direction and failing to capitalize on the party’s 2024 general election success.

The broader political context includes recent by-election gains by the Scottish Conservatives in Aberdeen South, attributed partly to debates over energy policy and North Sea oil, highlighting the complex challenges any incoming Labour government would face in balancing environmental commitments with economic realities.

As Burnham prepares to be sworn in as an MP and formally engage with Starmer, the Labour Party stands at a crossroads. The coming days will likely determine whether power transfers smoothly through negotiation or escalates into a leadership contest, with significant implications for the party’s unity and Britain’s political trajectory.