UK 30-year gilt yields surge to highest since 1998 as Starmer fights to stay on

LONDON — British government borrowing costs surged to their highest level in nearly three decades on Monday, as Prime Minister Keir Starmer fought to contain a rolling rebellion inside the Labour Party triggered by catastrophic local election losses.

The yield on the UK’s 30-year gilt climbed to 5.80 percent, a level last seen in 1998, while the pound dropped 0.7 percent to $1.3517. Driving the sell-off further, Starmer convened a cabinet meeting at which he told ministers he would not resign, despite more than 80 Labour members of Parliament — roughly one in five — publicly demanding he step aside.

And the numbers are not just a chart pattern. Each step higher in the 30-year yield compounds the fiscal burden on a government whose borrowing requirements already sit uncomfortably close to the limit of what the Office for Budget Responsibility projected in March. Tax receipts are running behind forecast, inflation is proving stickier than the Bank of England expected, and the political class is now absorbed in an argument about its own survival.

“I take responsibility for these election results and I take responsibility for delivering the change we promised,” Starmer told reporters after the meeting. “The country expects us to get on with governing.”

Markets delivered their own verdict. The 30-year gilt sell-off widened the spread between UK debt and its German equivalent to the highest since the 2022 mini-budget crisis under Liz Truss — an episode no one in Westminster needs a reminder of.

How Labour’s local rout became a gilt-market event

Thursday’s local elections provided the spark. Labour lost 1,498 councillor seats while the insurgent Reform Party gained 1,452 — a rout that far exceeded internal party forecasts and shredded the prime minister’s electoral argument that only he could keep the populist right at bay.

What began as simmering backbench discontent over Starmer’s poll numbers and policy compromises transformed within 72 hours into a leadership crisis that has now reached the cabinet table.

On Monday, Miatta Fahnbulleh, the junior minister for devolution, faith and communities, became the first government minister to resign. In a letter made public within minutes of delivery, she urged Starmer to “do the right thing for the country and the Party and set a timetable for an orderly transition.” At least four ministerial aides followed before nightfall, and the prime minister’s aides briefed newspapers that more were expected by Tuesday morning.

Senior Labour figures spent the weekend openly weighing whether Health Secretary Wes Streeting — widely regarded as the most credible successor — would move against the prime minister before the end of the week. Streeting himself remained silent, which Westminster read as its own signal. His allies told the BBC he was “listening to colleagues” but had made no decision.

The fiscal arithmetic gets tighter

The gilt market’s reaction reflects a specific anxiety: that a protracted leadership vacuum could freeze fiscal decisions already strained by sluggish growth and sticky inflation. Consider the cost: the 30-year yield’s ascent from 4.40 percent at the start of 2026 to 5.80 percent on Monday adds roughly £400 million to the government’s annual debt-service costs for every percentage point on the long end of the curve, according to analysts at a major investment bank.

“A government in paralysis is exactly what the gilt market does not want to see right now,” said one London-based rates strategist who requested anonymity because of the sensitivity of the situation. “The fiscal arithmetic was already tight. Political drift makes it tighter.”

Historical context sharpens the picture. When 30-year gilts last traded at these levels, Tony Blair was in his first term, the Bank of England had just been granted operational independence, and the UK was running a budget surplus. May 2026 is the mirror image: a deficit north of 4 percent of GDP, a central bank constrained by persistent inflation, and a government whose political authority is eroding by the hour.

The pound’s slide to $1.3517 compounds the pressure. A weaker sterling feeds import prices at a moment when the Bank of England has signalled it cannot cut rates as aggressively as markets had priced in, keeping mortgage costs elevated for millions of households. So the political crisis and the economic one now feed each other in a cycle that neither the Treasury nor Number 10 has a clear plan to break.

What happens next

Starmer’s allies insist the prime minister retains majority support inside the parliamentary party and that the public criticism emanates from a noisy minority amplified by a restless press gallery. But the steady rhythm of defections — and the conspicuous silence from the chancellor and the foreign secretary — has left Westminster pricing in his departure as a question of timing, not probability.

Late Monday, the prime minister’s office said Starmer intended to reshuffle his cabinet within days in an effort to reassert authority. That move may buy him weeks or merely hours. The answer turns on whether Streeting and other senior figures decide to stay their hands — or reach for the knife.

Either way, the gilt market has already cast its own vote. And for a prime minister who built his leadership pitch on fiscal credibility, that may prove the hardest judgment to overturn.