The British pound plunged and UK government bonds faced heavy selling on Friday, as markets reacted to the prospect of a significant leftward shift under the country's potential next prime minister. Labour Party leader Keir Starmer is under pressure after a key intra-party rival, Manchester Mayor Andy Burnham, announced his intention to run for a seat in Parliament, a move that would bolster his credentials to challenge for the premiership. Investors suggest UK financial assets and the pound may now face a "higher political risk premium."
UK government bonds and the pound sterling are under increasing strain, driven by market fears that a new left-wing prime minister could challenge the country's fiscal discipline and adopt a confrontational stance towards the bond market. On Friday, as a key obstacle to a challenge for Starmer's leadership was cleared within the Labour Party, investor reaction intensified the selling pressure. This followed comments from former US President Donald Trump, who told reporters that Starmer's political future would be "in trouble" if he failed to address core issues like immigration and energy policy. Andy Burnham, the current Mayor of Greater Manchester who is not currently a sitting UK MP, secured a new pathway into the House of Commons on Friday, potentially accelerating his bid for 10 Downing Street. He will contest an upcoming by-election in the Makerfield constituency in northwest England. The sitting MP, Josh Simons, has agreed to resign, clearing the way for Burnham, often called Labour's "King of the North," to stand. In January, Burnham attempted to contest a by-election but was blocked by Starmer's allies, aiming to prevent a leadership challenge. Now, with the ruling Labour Party suffering a devastating defeat in last week's local council elections, Starmer faces immense pressure to resign. If Burnham defeats the surging right-wing Reform Party in the upcoming election, his standing in a potential leadership contest would be significantly strengthened.
**Concerns Over a Leftward Shift** The prospect of Burnham leading Britain is alarming investors. Last year, the Manchester Mayor launched a fierce attack, accusing the UK government of being "hostage to the bond market." Traders also worry that more radical left-wing policies could break the current government's commitments to fiscal austerity. These potential policies include an additional £40 billion in borrowing for housing and infrastructure, and higher taxes on luxury properties in London and the Southeast. On Friday, the pound fell to a one-month low against the US dollar, extending a week-long decline fueled by speculation about the challenge to Starmer. In early trading, sterling was down 0.3% at $1.3363. Simultaneously, the yield on the 10-year UK government bond—a benchmark for UK debt—remained above 5%, rising over 1 basis point on Friday to 5.137%. Elias Haddad, Global Head of FX Strategy at Brown Brothers Harriman in New York, stated that a Labour government led by Burnham would likely increase spending and borrowing. "Political uncertainty will continue to dominate price action for sterling and gilts, with a downside bias given the UK's deteriorating fiscal credibility," Haddad said in a note on Friday. "With UK nominal GDP growth below the 10-year gilt yield, reining in debt growth is extremely difficult." Haddad cited recent polling showing 61% of Labour Party members support Burnham, compared to only 28% for Starmer. Data from the prediction market Polymarket also indicates Burnham is now the most likely next UK Prime Minister with a 42% probability. Starmer's chances of remaining in office are just 27%, while his former deputy, Angela Rayner, has a 12% chance.
**Political "Psychodrama"** Analysts at Deutsche Bank noted that Burnham has partly walked back his comments from last year regarding the bond market, stating in February that the market should not be ignored. However, Neil Mehta, a Macro Portfolio Manager at RBC BlueBay Asset Management, believes a Labour government will represent a clear shift to the left, impacting markets and asset prices. "The next Labour leader will come from the party's left wing. Against this backdrop of uncertainty, UK financial assets and sterling are likely to face a higher political risk premium for an extended period," Mehta said. Meanwhile, Peter Ricketts, a member of the House of Lords and former diplomat, warned that a fresh round of "Westminster psychodrama" would damage the UK's international reputation and influence. "If Starmer is fighting for his job at home, his authority in Europe to deal with crises in Ukraine and Iran will be significantly diminished," Ricketts said. "The EU will have little appetite to negotiate a deeper relationship with Britain if it is unsure who will be Prime Minister in a few months."
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