Starmer resigns as UK's 6th PM in 7 years, Burnham set to lead

Keir Starmer became the shortest-serving Labour prime minister in a century Monday, resigning after a party rebellion that will hand power to Andy Burnham.

British Prime Minister Keir Starmer resigned Monday after a rebellion in his Labour Party, clearing the path for former Greater Manchester Mayor Andy Burnham to become the country's sixth prime minister in seven years.

"The party has lost faith in Starmer's ability to connect with voters and counter the rise of Reform UK," said Tim Bale, professor of politics at Queen Mary University of London. "Burnham represents a last chance to reverse Labour's decline before the next election."

Starmer's departure follows a by-election victory Thursday by Burnham in the Makerfield constituency, where he defeated Reform UK candidate Robert Kenyon by 24,927 votes to 15,696 — a 54.8% share. The win gave Burnham a parliamentary seat and the 81 nominations needed from fellow Labour lawmakers to trigger a leadership challenge. More than 110 Labour MPs had signed a letter calling for Starmer to step down, according to reports.

The leadership change injects uncertainty into UK financial markets. Burnham, who has advocated "business-friendly socialism" and pledged to decentralize power from London, would inherit an economy blighted by low productivity, rising borrowing costs and an aging population. Taxes are already at a postwar high as a share of GDP, and the government faces pressure to boost military spending while funding social programs. The yield on 10-year UK gilts rose 8 basis points Monday as investors weighed the fiscal implications, while sterling slipped 0.3% against the dollar.

Burnham, 56, rose through the ranks under former Prime Ministers Tony Blair and Gordon Brown, serving in cabinet between 2007 and 2010 before twice failing to win the Labour leadership. He rebuilt his political career as mayor of Greater Manchester, where he took public transport under municipal control, branded it the Bee Network and oversaw a regeneration boom that saw skyscrapers rise on post-industrial sites. His signature "Manchesterism" — a politics that puts people and place before party — resonated with voters in the working-class northwest.

Investors Weigh Burnham's Fiscal Plans

Investors are closely watching for signs that Burnham will increase borrowing or raise taxes. He has recently pivoted toward the center, pledging to abide by the current government's fiscal rules and maintain Labour's approach to cutting immigration. But his past support for greater public control over utilities and re-industrializing left-behind regions has raised questions about spending priorities. The UK's budget deficit stood at 4.4% of GDP in the last fiscal year, limiting fiscal headroom.

The transition marks a dramatic fall for Starmer, who won the second-largest parliamentary majority since World War II in July 2024. His government brought down inflation from above 11% to near the 2% target, cut legal immigration and reduced hospital waiting lists. But a series of missteps — including accepting free clothing from a donor, axing a winter fuel benefit for pensioners and passing the biggest tax hikes in the postwar era despite a campaign pledge not to — eroded public trust. Half of Labour's 2024 voter base subsequently deserted the party, according to polling data.

The last time a British prime minister was ousted by their own party mid-term was Margaret Thatcher's resignation in November 1990. Unlike Thatcher, who was replaced by John Major and led the Conservatives to a surprise election victory in 1992, Starmer leaves a Labour Party trailing Reform UK in opinion polls. The next general election is scheduled for 2029, though pressure could mount for an early vote if Burnham's popularity fades.

This article is for informational purposes only and does not constitute investment advice.