UK Gilt Yields Hit 4.97% as Starmer Leadership Crisis Deepens

UK borrowing costs surged, with 10-year gilt yields climbing 6 basis points to 4.974%, as investors priced in heightened political risk following the Labour party's poor showing in local elections and mounting pressure on Prime Minister Keir Starmer's leadership.

"Bond investors are selling gilts as they now consider the UK government to be a riskier proposition," said Russ Mould, investment director at AJ Bell. "The potential for a leadership challenge is growing by the minute following Labour’s washout showing in last week’s local elections."

The selloff pushed 30-year gilt yields to 5.63%, while sterling fell 0.2% against the dollar to $1.3601. The euro gained 0.1% on the pound to 0.8651, a near two-week high. In contrast, UK equities were relatively stable, with the blue-chip FTSE 100 index adding 0.25% to 10,258 points as domestic-focused companies lagged.

Markets are concerned that a potential successor to Starmer, such as Greater Manchester Mayor Andy Burnham, could pursue a looser fiscal policy, increasing borrowing and spending. This could force investors to demand a higher risk premium on UK debt, risking what one strategist called a "toxic fiscal spiral" of low growth and higher borrowing costs.

Prime Minister Starmer said Monday he has no plans to resign and vowed to address the nation's challenges, but his speech did little to calm market nerves. The prospect of a prolonged leadership contest, potentially lasting for months, injects significant uncertainty into the UK's economic policy direction. "Signs of fiscal slippage may see investors demand higher compensation for holding U.K. government debt, which could push borrowing costs higher," UBS economists Dean Turner and Maelle Quillevere said in a note.

This investor anxiety is rooted in recent memory. In September, comments from Andy Burnham that the U.K. should no longer be "on hock to the bond markets" triggered a sharp rise in gilt yields. While he later downplayed the remarks, the episode highlighted market sensitivity to any perceived deviation from fiscal discipline.

"The demand for higher term premium leaves the government at risk of a toxic fiscal spiral of low growth and higher borrowing costs whereby worries about fiscal policy lead to higher borrowing costs," wrote Barclays fixed income strategist Moyeen Islam. The political instability adds another layer of risk for investors already contending with inflationary pressures from the ongoing conflict in the Middle East, which recently pushed oil prices up 3.5% to over $104 a barrel.

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