Key Highlights

  • Sterling weakened to approximately $1.32, nearing its year-to-date low, after Prime Minister Keir Starmer resigned, with Andy Burnham's frontrunner status and reputation as a fiscal dove driving concerns about higher government spending and gilt pressure.
  • The Bank of England held rates at 3.75% this month and revised its peak inflation forecast for the fourth quarter of 2026 down to 3.25% from 3.6%, providing a partial monetary policy cushion against the political risk repricing.
  • Foreign investors are pivoting out of pound-denominated assets as UK gilt yields, already among the highest in the G7, face additional upward pressure from the prospect of a more expansionary successor government.

Sterling's decline toward $1.32 on Monday reflects a market assessment that Starmer's resignation introduces a meaningful probability of fiscal policy loosening under his successor. Andy Burnham, who won the Makerfield by-election last week and is widely seen as the frontrunner for the Labour leadership, is characterised as a fiscal dove who has called for higher government expenditure across public services and infrastructure, a policy direction that carries direct implications for gilt issuance and the UK's already elevated sovereign borrowing costs.

UK gilt yields entering the leadership contest from a position of being among the highest in the G7 means that any additional upward pressure from fiscal loosening expectations arrives at a level where foreign investors are particularly sensitive to the risk-reward of holding pound-denominated assets. The combination of high starting yields and a new risk premium from political uncertainty is creating a double headwind for sterling that is difficult to offset in the near term.

The Bank of England's revised peak inflation forecast of 3.25% for the fourth quarter of 2026, down from 3.6%, provides a partial offset by reducing the probability of further rate increases from an inflation-fighting motivation. However, if a Burnham government pursues materially higher spending, the Bank's rate path assumptions could be revised upward again, removing the comfort the downward inflation revision provides.