The recent local election outcomes have complicated the political backdrop. Labour shedding support to both the Greens on the left and Reform on the right suggests a fragmentation of the electorate that rarely leads to stable policy direction. The prospect of a leadership challenge - or at the very least, weakened authority for the Prime Minister - adds further uncertainty.
For markets, uncertainty is rarely welcome. The concern is not simply who leads, but what they are incentivised to do. If the political centre weakens, policy tends to drift outward. In this case, that likely implies a tilt toward more left‑leaning fiscal policy - potentially higher spending, more intervention, and less commitment to existing fiscal rules.
Bond investors are highly sensitive to such shifts. The UK has learned this lesson before. The “mini‑Budget” episode in 2022 showed how quickly gilt markets can react when fiscal credibility is called into question. While today’s situation is far less extreme, the mechanism is the same: if investors worry about rising borrowing, they demand a higher yield to compensate.
That process is already underway. The 30‑year gilt yield has risen back to levels last seen in the late 1990s, and 10‑year gilt yields have increased by around 0.6% so far this year - materially more than comparable moves in German Bunds or US Treasuries. This relative underperformance reflects a UK‑specific risk premium building into the market.