Keir Starmer resigns: what happens next for UK politics

Keir Starmer has resigned as Prime Minister, plunging British politics into its most turbulent moment in years and triggering an immediate scramble inside the Labour Party to determine who will lead both the government and the country forward.

Starmer’s departure, confirmed in a brief statement outside Downing Street, ends a tenure that lasted less than 18 months — one of the shortest in modern British political history. He cited what he called an inability to build the national consensus he believed the role demanded. But for many observers, his resignation had been coming for weeks.

What triggered the resignation?

The pressures on Starmer had been building since early 2025. A string of cabinet rebellions, polling numbers that fell sharply through winter, and growing unrest among Labour backbenchers over economic policy all eroded his authority. His approval rating had dropped to just 23 percent in the most recent YouGov survey — a figure that made his position almost untenable. Still, many inside Westminster believed he’d try to hold on until the summer recess. He didn’t.

Senior Labour figures had privately signalled to allies in recent days that a resignation was likely. One party official, speaking on condition of anonymity, said: “The mood in the parliamentary party changed dramatically after the local election results. That was the moment people stopped defending him.”

Who takes over immediately?

Under constitutional convention, the deputy prime minister assumes temporary responsibility for government business until a new leader is confirmed. Angela Rayner, who holds that role, is expected to chair Cabinet in the coming days and manage the day-to-day running of government. But she won’t be acting prime minister in any formal sense — that title remains vacant until Labour selects a new leader.

The King has been informed.

A leadership contest is now almost certain to be triggered within days. The Labour Party’s national executive committee is expected to meet as early as Thursday to establish the rules and timetable. Past contests have taken anywhere from six weeks to several months, depending on the number of candidates and the urgency of the political moment.

Who are the likely candidates?

Several names are already circulating. Wes Streeting, the Health Secretary, has support among centrist MPs and has been positioning himself for a potential leadership bid for months. Bridget Phillipson and Yvette Cooper are also seen as credible contenders. On the left, there’s pressure to field a candidate who can reconnect with disillusioned working-class voters who drifted from Labour during Starmer’s time in office.

And then there’s the broader question of whether this forces an early general election. Technically it doesn’t have to — Labour still holds a substantial Commons majority. But opposition parties will make as much noise as possible about democratic legitimacy.

What does this mean for the country?

Markets reacted nervously on Wednesday morning, with sterling slipping 0.4 percent against the dollar within an hour of the announcement. Business groups called for stability. The next few weeks will test whether Labour can move quickly enough to reassure both voters and financial markets that it remains a functioning government with a credible direction.

One thing is certain: British politics, rarely boring, just got significantly more unpredictable.