Britain has become a country that discards prime ministers every two years
In the decade since Britain's Brexit referendum reshaped its political landscape, the United Kingdom has cycled through six prime ministers — a pace of turnover that would have seemed unthinkable during the four decades prior. Now Keir Starmer, who arrived at Downing Street in July 2024 with a commanding mandate, finds himself besieged by his own party, a reminder that in Westminster's parliamentary system, electoral victory is no guarantee of political survival. The question Britain faces is not merely who leads, but whether its institutions can recover the stability that once made its governance a model for the world.
- More than eighty Labour MPs are demanding Starmer's resignation, and five cabinet ministers — including the formidable Health Secretary Wes Streeting — have already walked out, leaving the government visibly hollowed.
- Streeting's departure was not merely symbolic: he immediately endorsed Andy Burnham as Starmer's successor, transforming a cabinet resignation into an opening move in a leadership contest.
- Burnham's path to challenging Starmer runs through a single by-election in Makerfield on June 18, where Reform UK's surging support threatens what was once an unassailable Labour stronghold.
- Starmer's deputy David Lammy has declared there will be no voluntary exit, but defiance in Westminster carries its own risks when the arithmetic of parliamentary confidence begins to shift.
- The broader pattern is damning: since 2016, Britain has also burned through eight chancellors and nine foreign secretaries, suggesting the instability reaches far deeper than any single leader's failings.
Britain has become a country that discards prime ministers with startling regularity. Since David Cameron resigned in the wake of the 2016 Brexit referendum, five successors have occupied Downing Street — and now, in May 2026, Keir Starmer faces an internal revolt that could make him the sixth to fall. More than eighty Labour MPs have called for his resignation, five cabinet ministers have departed, and his most dangerous rival, Andy Burnham, is waiting in the wings.
The immediate crisis was triggered by local election losses and a cascade of high-profile departures. Wes Streeting, the Health Secretary and one of Starmer's most capable internal opponents, resigned and swiftly endorsed Burnham as a successor. Burnham's route into Parliament — and into a formal leadership challenge — runs through a single by-election in Makerfield, Greater Manchester, scheduled for June 18. The seat has been safely Labour since 1983, but Reform UK captured more than half the local vote in the region's recent elections, making nothing certain. Should Burnham win the seat, he would still need the backing of eighty-one Labour MPs to mount a formal challenge to Starmer — a threshold that is tight but not out of reach.
What makes this moment historically striking is the sheer pace of change. Between 1979 and 2016, Britain had only five prime ministers across thirty-seven years. Since 2016, it has averaged a new one every two years. Cameron fell on Brexit. May could not pass her withdrawal deal. Johnson was brought down by scandal. Liz Truss lasted forty-nine days before her economic programme collapsed the markets. Rishi Sunak steadied the ship only to lead the Conservatives to electoral ruin. Starmer won a sweeping majority in 2024 and now finds himself fighting for survival before completing two years in office.
Experts point to multiple causes: the unresolved fractures of Brexit, economic constraint, and a string of leaders ill-equipped for governing under genuine pressure. Yet the British system itself has not changed — it still concentrates enormous power in a government with a parliamentary majority. What has changed, some argue, is the willingness and ability to use that power. Starmer has signalled he intends to fight on. But in a system where prime ministers now fall to internal party pressure rather than the ballot box, resolve alone may not be sufficient. The Makerfield result on June 18 will offer the clearest signal yet of whether his party still has the will to keep him.
Britain has become a country that discards prime ministers the way other nations cycle through cabinet ministers. In the decade since David Cameron walked away from Downing Street in the aftermath of the Brexit referendum, five successors have occupied his office: Theresa May, Boris Johnson, Liz Truss, Rishi Sunak, and Keir Starmer. Now, in May 2026, Starmer himself is under siege from within his own party, with more than eighty Labour MPs demanding his resignation and five cabinet ministers already gone. His deputy David Lammy made clear on Monday that there would be no graceful exit timeline—Starmer was staying put, at least for now. But the arithmetic of Westminster suggested otherwise.
The immediate crisis centers on recent local election losses and a cascade of high-profile departures. Wes Streeting, the Health Secretary and one of Starmer's most formidable rivals, resigned on Thursday and almost immediately threw his support behind Andy Burnham, the left-leaning figure many see as Starmer's most plausible successor. Burnham's path to power runs through a single by-election in Makerfield, a constituency in Greater Manchester scheduled for June 18. The seat has been Labour territory since its creation in 1983, delivering roughly forty percent of the vote to the party in every general election since. But the political ground has shifted beneath those old certainties. Reform UK, Nigel Farage's far-right party, captured more than half the vote in recent local elections across the region. If Burnham can win Makerfield and enter Parliament, he would need the backing of eighty-one Labour MPs—roughly twenty percent of the party's parliamentary strength—to formally challenge Starmer for the leadership. The math is tight, but not impossible.
What makes Starmer's predicament historically remarkable is not the crisis itself but its context. Over the past decade, Britain has averaged a new prime minister every two years. Cameron departed in 2016 after the Brexit vote went against him. May followed, unable to secure parliamentary backing for her withdrawal agreement and resigning in 2019. Johnson succeeded her, credited with finally delivering Brexit but eventually undone by scandal—lockdown parties, ministerial defections, collapsing party support—and forced out by his own Conservative MPs in 2022. Liz Truss arrived next and lasted forty-nine days, the shortest tenure in British history, before her mini-budget triggered financial chaos and her own resignation. Rishi Sunak stabilized the markets and the machinery of government but led the Conservatives into electoral collapse. Starmer won the general election and took office on July 5, 2024, only to find himself, less than two years later, fighting for survival against his own backbenchers.
This volatility is not entirely without precedent in British history. There were seven governments between 1827 and 1835, eight between 1852 and 1868, and seven between 1922 and 1937. But the present era stands apart. Between 1979 and 2016—a span of thirty-seven years—Britain had only five prime ministers: Margaret Thatcher, John Major, Tony Blair, Gordon Brown, and David Cameron. The contrast is stark. Since 2016, the country has also cycled through eight chancellors and nine foreign secretaries, a churn that extends far beyond the top office. As one analyst noted, the six prime ministers since 2016, soon to be seven if Starmer falls, represent something genuinely unusual when measured against the wider institutional instability.
The roots of this instability run deep. Brexit fractured both major parties and left successive leaders navigating an unresolved national question that refused to disappear. Economic pressures—inflation, public debt, the grinding difficulty of governing in an era of constraint—have made the job harder. But experts point to another factor: the prime ministers themselves. Some scholars argue that British political parties have recently elevated leaders lacking the skills required to navigate genuine crisis. As one think tank director observed, the British system grants enormous power to a government with a parliamentary majority. That this power has not been deployed effectively to drive change is less a sign of systemic ungovernability than a failure of leadership. The machinery exists. The will to use it has been absent.
Unlike the United States, Britain has no fixed term for its prime minister. One can serve indefinitely so long as they retain the confidence of a majority in the House of Commons. Margaret Thatcher served over eleven years; Robert Walpole, the first to hold the office, served more than twenty. A general election must occur at least every five years, but a party can remove its leader at any moment. That power, once rarely invoked, has become routine. Starmer's defiance of the resignation calls suggests he intends to fight. But in a system where prime ministers now fall to internal party pressure rather than electoral defeat, defiance alone may not be enough. The Makerfield by-election on June 18 will tell much about whether his party still has the will to keep him.
Notable Quotes
There will be no timetable for departure— Deputy PM David Lammy, on Starmer's plans to stay in office
That this majority has not been deployed to drive through change is a failure of leadership rather than being indicative of a systematic trend towards ungovernability— Professor Anand Menon, UK in a Changing Europe think tank
The Hearth Conversation Another angle on the story
Why does Britain keep cycling through prime ministers so quickly now? It wasn't always like this.
The pattern really began with Brexit. It created divisions so deep that no leader could navigate them cleanly. Once Cameron lost that referendum, every successor inherited an impossible problem—how to deliver something the country had voted for but remained bitterly divided over.
But that's just one issue. Surely other countries face economic pressure and political division.
True, but the British system makes leaders vulnerable in a particular way. They don't need to lose an election to fall. Their own party can simply remove them. That's what's happening to Starmer now—not voters rejecting him, but his own MPs.
So it's about the rules of the game, not just the players.
Partly. But the players matter too. Experts argue that the parties have elevated leaders without the skills to actually govern during crisis. The system gives them enormous power, but they haven't used it effectively.
What does Starmer's situation tell us about where this ends?
It suggests the instability isn't over. If Burnham wins that by-election in Makerfield and challenges Starmer, we could see a seventh prime minister since 2016. The question is whether any of them will have the leadership to actually stabilize things.