Long-dated UK government bond yields rose on Friday as political uncertainty around Prime Minister Keir Starmer’s leadership combined with stronger-than-expected economic data, pushing up the cost of government borrowing and reshaping expectations for interest rates and future gilt issuance.
Yields rise on political headlines
Ten-year gilt yields were up 3.4 basis points in afternoon trading, extending earlier weakness that had been building through the session.
The move followed reports that former United States ambassador Peter Mandelson had initially failed security vetting, a decision that was later reversed. Analysts at Deutsche Bank said part of the yield increase reflected rising political uncertainty tied to Starmer’s position, with markets reacting quickly to the news.
Traders weighed the risk that any shift in government leadership could lead to looser fiscal policy, higher borrowing, and ultimately greater gilt supply over time.
Stronger growth data adds pressure
Gilts were already underperforming before the political headlines hit. Official data showed the UK economy grew 0.5% in February, more than double the 0.2% consensus forecast and the strongest monthly increase since January 2024.
The upside surprise prompted a reassessment of both monetary and fiscal prospects ahead of the next Budget, as stronger growth can give policymakers more room to keep policy tight for longer.
Inflation remained at 3% in February, still a full percentage point above the Bank of England’s 2% target, reinforcing expectations that rates may need to stay elevated.
Bank of England rate cuts may be delayed
The Bank of England has held its main policy rate at 3.75% since December. Following the combination of firmer growth and persistent inflation, traders are increasingly pricing in the risk that any rate cuts pencilled in for later this year could be pushed back.
The central bank’s next policy decision is due on 30 April and will be closely watched for signals on how it balances stronger activity data against ongoing price pressures.
Higher yields shift relative appeal of assets
Rising gilt yields mean the government must pay more to borrow, and that traders are demanding a higher return to hold UK debt. As returns on traditionally safer assets increase, they can become more attractive relative to higher-risk holdings, prompting a re-think of portfolio allocation.
A higher “risk-free” rate can draw capital away from speculative or purely price-driven trades and towards assets offering steadier income, particularly if expectations grow that tight monetary policy will persist.
Political uncertainty feeds risk premium
The controversy around Mandelson’s vetting and the speculation it triggered over Starmer’s stability in office has added a fresh layer of political risk to the UK outlook. Markets typically require a higher premium when leadership changes or policy reversals become more plausible, especially if a new administration might relax current fiscal constraints and expand borrowing.
A recent survey shows 88% of UK business leaders believe their organisations are being affected by rising uncertainty linked to domestic politics and global conflicts, underlining the broader mood of caution.
Possible rotation toward defensive positions
For traders active in more volatile areas of the market, this backdrop of firmer yields, delayed easing expectations and heightened political noise points to a potential shift in capital flows.
As low-risk government bonds offer better returns and liquidity, the two traditional supports for speculative rallies — cheap money and abundant risk appetite — appear less robust. The coming weeks could see more funds move out of high-volatility instruments and into assets with more predictable income, as markets adjust to a higher and possibly longer-lasting cost of money.
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