Starmer’s Resignation as UK PM Sees Focus Shift to Burnham’s Fiscal Stance

Keir Starmer’s resignation formalises a political transition that had already been widely anticipated after Labour’s poor local election results and months of pressure on his leadership. In that sense, today’s announcement is primarily confirmation of a succession process investors had already begun to price in, hence the relatively muted market response. Indeed, at the margin, markets responded positively as developments look to have lifted some uncertainty and accelerated the arrival of a new administration, with gilt yields falling modestly. Attention is now shifting from Starmer’s exit to what a post-Starmer government might mean for policy. With Andy Burnham emerging as the clear favourite to become prime minister, we think any fiscal shift is more likely to be redistributive than expansionary, though macro and geopolitical considerations will likely continue to dominate the direction of gilts in particular.

In recent weeks, UK assets have not been especially sensitive to Westminster drama in isolation; rather, gilts and sterling have been driven more by growth concerns, energy prices, and resultant expectations for Bank of England (BOE) policy. Because Starmer was already widely expected to lose any leadership contest, his resignation is unlikely on its own to trigger a large repricing. The bigger question is whether Burnham has the capability to catalyse a turnaround in the weak UK growth outlook without further deteriorating the country’s fiscal balance.

Burnham is generally seen as more comfortable than Starmer with an activist domestic agenda, particularly around housing, regional investment, infrastructure, and industrial policy. Burnham’s natural inclination is also to spend more, but that would need to be financed primarily by higher taxes, given he has expressed his commitment to abiding by current fiscal rules. Such a redistributive goal could shift the tone of UK policy debate and create more differentiation across domestically exposed sectors. However, it seems inevitable that any new prime minister would remain bounded by the same constraints that have challenged predecessors: limited fiscal room, high borrowing needs, and the prospect of strong market discipline. In other words, a Burnham premiership could change policy emphasis more easily than it changes the underlying UK macro constraints or direction.

This point is especially important in the current environment. We recently argued that markets may be overestimating how much the BOE will need to tighten in response to the energy shock. Indeed, the tentative agreement between the United States and Iran to end the war may eventually put downward pressure on energy prices. In any case, for the United Kingdom, higher energy prices look more likely to weaken growth than to generate broad, persistent inflation pressure. Labour market conditions have softened, wage growth is becoming less threatening, and second-round inflation risks are less likely to emerge as a result. That suggests the main macro story for UK markets remains one of weaker activity and potentially less BOE tightening than currently priced.

If Burnham were to raise doubts about fiscal discipline, gilt yields could come under renewed pressure and sterling could weaken. Absent a clear signal of fiscal slippage, we believe UK bonds still appear cheap compared to the most likely macro paths. This continues to support the case for UK gilts on a relative value basis versus global government bonds for UK-based investors. In equities, any impact is likely to be more sector-specific, with domestic and regulated industries more exposed to changes in policy tone than large multinational businesses.

For investors then, Starmer’s resignation is best understood as the expected formalisation of a transition rather than the start of a new market regime. The key question now is whether a Burnham government would risk undermining the United Kingdom’s budgetary credibility by materially loosening fiscal policy to pursue his economic agenda. We doubt the new government will be so bold, and is unlikely to seriously test the market’s willingness to impose fiscal discipline. Instead, macro and geopolitical forces still look more important than political considerations for the direction of UK assets.