UK 30-year gilt yield hits 5.86% after Burnham gains

On May 15, 2026, UK government bond yields jumped after Manchester Mayor Andy Burnham gained the ability to run for a parliamentary seat. The 30-year gilt yield rose as much as 20 basis points to 5.86%, its highest level since 1998. The 10-year yield climbed to 5.18%, a level not seen since 2008.

Traders priced the move as increasing the chance Burnham could seek Labour’s leadership in future. Market participants cited the potential for higher public spending and larger budget deficits under a different leadership approach, which would require more government borrowing.

Prices of gilts fell sharply as yields rose. The pound weakened against the dollar and was on track for its worst weekly performance since 2024. Market volatility followed the yield moves across the UK debt curve.

Investors noted that the UK’s public debt-to-GDP ratio is at its highest level since the 1960s. That metric and the higher borrowing implied by some political plans were central to market concern about increased supply of government bonds.

Burnham has described the UK as “in hock” to the bond markets and has suggested defence spending could be treated differently within fiscal rules. Market participants referenced those comments when assessing possible shifts in fiscal strategy.

Market pricing for Bank of England policy changed alongside the gilt sell-off. Where traders had expected rate cuts, some began to price the possibility of further rate increases, narrowing the window for easier monetary policy. Traders and analysts said gilt and currency positions may stay sensitive to political developments until party fiscal plans are clearer.