Why have UK gilt yields risen more than US Treasuries or German bunds?

The UK imports roughly 40% of its natural gas and is heavily exposed to global energy prices. The Strait of Hormuz disruption pushed oil toward $99, hitting UK inflation expectations harder than countries with greater energy independence. This added an 80 basis-point risk premium to gilts at peak versus 48bp for US Treasuries and 42bp for German bunds, though yields have since pulled back to around 4.80% as partial de-escalation signals emerged.

Will the Bank of England raise interest rates in 2026?

Markets are now pricing fewer than two rate increases — sharply down from four projected in mid-March — as the initial shock has been partially digested. The April MPC meeting carries approximately a 47% implied probability of a cut, reflecting genuine uncertainty. The BoE held unanimously at 3.75% in March, and the May meeting will be decisive once March CPI data is available.

Is now a good time to buy gilts?

Gilt yields around 4.80% offer among the highest income in nearly two decades, which is attractive for hold-to-maturity investors. The pullback from the 5% peak reduces the immediate downside risk, but uncertainty remains. Shorter-duration gilts or index-linked gilts carry less risk in this environment than long-dated conventional gilts.

How does the Iran conflict affect UK inflation?

The conflict has disrupted oil flows through the Strait of Hormuz, pushing crude toward $99 a barrel. Every $10 rise in oil adds roughly 0.3-0.4 percentage points to UK headline inflation within two to three months. UK CPI was already at 3.0% in February. The passage of a French vessel through the Strait in early April without incident is an early sign of partial normalisation, though the full picture remains uncertain.

How does this compare to the 2022 gilt crisis?

The 2022 crisis was a domestic fiscal shock (the Truss mini-budget) that the BoE could address through emergency bond purchases. The current sell-off is driven by an external geopolitical event that central bank intervention cannot fix. It is slower-burning and structurally harder to reverse as long as the conflict persists.

UK Gilts Analysis: Yields, BoE Policy & Outlook

Updated April 3: Gilt yields have pulled back from the 5% peak, settling around 4.80% in early April as partial de-escalation hopes emerged — a French vessel passed through the Strait of Hormuz without incident, and US payrolls surged unexpectedly in March, suggesting the global economy is absorbing the shock better than feared. The 5% level now stands as a mid-March peak rather than a new floor. The narrative below reflects the period through late March; the April developments are tracked in the closing section.

Six weeks ago, gilt investors were quietly celebrating. The Bank of England had cut rates to 3.75%, inflation was drifting toward target, and 10-year gilt yields sat around 4.3% — painful, but trending in the right direction. Then Iran changed everything. Since the outbreak of conflict in late February, UK 10-year gilt yields surged past 5% for the first time since the 2008 financial crisis in mid-March, before retreating to around 4.80% in early April as partial de-escalation hopes emerged — adding over 80 basis points to government borrowing costs in under a month before the partial reversal. The rate-cutting cycle that markets had priced in is not merely paused — it is dead. Britain's status as a major energy importer has turned its bond market into the sharpest barometer of the global oil shock, and what that barometer reads is deeply uncomfortable.

From Cautious Thaw to Full Freeze

The February Monetary Policy Committee meeting already hinted at fragility. The vote to hold rates at 3.75% came on a knife-edge 5-4 split, with four members pushing for an immediate cut. Markets responded by pricing a full quarter-point reduction by May, with two more by year-end. Gilt yields eased. The mood was cautiously optimistic.

The March meeting told a different story entirely. The MPC voted unanimously to hold at 3.75% — no dissent, no dovish minority, no ambiguity. The minutes cited "material upside risks to inflation from energy prices and supply chain disruption." That unanimity speaks volumes: even the doves on the committee have capitulated.

The yield chart traces the damage in real time. From a relatively stable 4.3% in mid-February, the 10-year gilt climbed steadily through early March before spiking above 5% on March 20 — a level not seen since the depths of the global financial crisis. The retreat to approximately 4.80% in early April offers some relief but cold comfort. Monthly average long-term gilt yields reported by FRED for February were 4.43%, but that figure already belongs to a different era. Daily trading now consistently prints between 4.7% and 5.1%.

Why UK Bonds Are Hit Hardest

Global bond markets have sold off across the board since the Iran conflict began, but the punishment has not been evenly distributed. UK gilts have absorbed the worst of it: an 80 basis-point surge at peak compared to 48 basis points on US Treasuries and 42 basis points on German bunds. The gap is not random.

Britain imports roughly 40% of its natural gas and is heavily exposed to global energy pricing. When the Strait of Hormuz disruption pushed oil toward $99 a barrel, the UK faced a repeat of the 2022 energy crisis dynamic — except this time, the starting point was already worse. CPI inflation stood at 3.0% in February, well above the 2% target, and the Office for National Statistics flagged rising energy costs as a primary contributor before the full impact of the conflict had even registered.

The UK-US yield spread has blown out further. With US 10-year Treasuries at 4.33% and Fed funds at 3.64%, the transatlantic gap sits around 47 basis points — a premium that reflects both the UK's energy vulnerability and lingering concerns about fiscal headroom after years of elevated borrowing.

For gilt investors comparing options, the picture has shifted materially. NS&I products now look relatively more attractive for those wanting government-backed exposure without mark-to-market pain, while gilt funds have taken capital losses as yields have surged.

Rate Cuts Are Dead, Rate Hikes Are Priced

The most consequential shift is in rate expectations. Before the conflict, overnight index swaps priced two to three Bank of England cuts by end of 2026. That pricing has completely inverted. As of early April, markets are pricing fewer than two rate increases, sharply down from four projected in mid-March, as the initial shock has been partially digested. The April MPC carries approximately a 47% probability of a cut — a signal that markets are no longer fully committed to the hiking path and are watching incoming data carefully.

This is not the BoE being hawkish for show. The transmission mechanism is brutally straightforward: oil at elevated levels feeds directly into UK transport, heating, and manufacturing costs. February CPI at 3.0% was already above target. March and April readings are expected to remain elevated as the energy shock works through supply chains, though the partial de-escalation may limit the upside. The BoE's own projections, published alongside the March decision, warned that inflation could return above 4% by mid-year if oil prices remain elevated.

For holders of longer-duration gilts, this repricing has been punishing. A 20-year gilt purchased in January at a yield of roughly 4.6% has lost approximately 8-10% of its market value in six weeks. Shorter-duration paper has held up better, but even 2-year gilt yields have risen by over 50 basis points as the front end of the curve adjusts to the evaporation of rate-cut hopes.

Investors concerned about inflation eroding returns should revisit index-linked gilts, which offer direct protection against rising RPI. Their real yields have also shifted, but the inflation linkage provides a structural hedge that conventional gilts cannot match in an energy-driven price shock.

The 2022 Parallel and What Makes This Worse

Comparisons to the 2022 gilt crisis are inevitable but only partially apt. In September 2022, the Truss mini-budget triggered a gilt sell-off driven by domestic fiscal policy — a self-inflicted wound that the Bank of England could address through emergency bond purchases. The current sell-off has external origins that no central bank intervention can neutralise.

The 2022 episode was acute but brief. Yields spiked, the BoE intervened, the government reversed course, and markets stabilised within weeks. The Iran-driven repricing is slower-burning and structurally harder to reverse. As long as the conflict disrupts energy supply routes and oil trades near $100, the inflationary pressure persists. The BoE cannot buy its way out of a supply shock.

There is also a fiscal dimension. The UK government's borrowing costs have risen by roughly 80 basis points across the curve at the peak. Applied to the existing stock of debt and planned issuance, that adds billions to annual debt servicing costs — money that either requires higher taxes, reduced spending, or yet more borrowing. The Office for Budget Responsibility's fiscal headroom, already thin, is being consumed by forces entirely outside the Chancellor's control.

What Gilt Investors Should Watch Now

Three variables will determine whether gilt yields stabilise near 4.80% or revisit the 5% peak.

First, oil prices. If the Strait of Hormuz disruption intensifies or spreads, $100+ oil becomes the baseline rather than the peak. Every $10 rise in crude adds roughly 0.3-0.4 percentage points to UK headline inflation within two to three months. Gilt yields will track that pass-through closely. The passage of a French vessel through the Strait in early April without incident was a meaningful signal — the first sign that commercial shipping may be partially normalising.

Second, the BoE's May meeting. The March unanimity was a holding pattern. By May, the committee will have March CPI data and a clearer picture of the conflict's economic impact. The April MPC already carries a roughly 47% implied probability of a cut — a signal of genuine uncertainty. If inflation has decelerated, the first rate cut since the crisis could return to the table, pushing yields lower.

Third, global macro resilience. US non-farm payrolls surged unexpectedly in March despite the Iran war — a signal that the global economy is proving more resilient than feared. If that resilience persists, risk appetite recovers, and the safe-haven bid for gilts and Treasuries fades, yields could drift back up. Conversely, continued strong data could give the BoE cover to hold rather than hike, which would be broadly supportive for gilts.

The cautious thaw of early 2026 is over. Gilt yields are at crisis-era levels not because of a domestic policy blunder, but because Britain's energy dependence has made its bond market the front line of a geopolitical shock. The 5% peak may have passed, but at 4.80%, gilts remain far from normalcy.

Conclusion

The Iran conflict fundamentally reset the UK government bond market, driving yields to levels not seen since 2008 and killing the rate-cutting cycle. By early April, a partial pullback to 4.80% — driven by de-escalation signals including a French ship's Strait passage and strong US payrolls — has taken the edge off the peak panic. But the underlying dynamics remain: UK CPI at 3.0% and still sticky, the BoE holding firm at 3.75%, and energy supply uncertainty unresolved. Whether 4.80% represents a floor or a temporary pause on the path back to 5% depends on how the conflict evolves. For gilt investors, the message is unchanged: the easing cycle is dead, inflation risks are elevated, and the UK's energy import dependence has made its bonds the most sensitive gauge of the global oil shock.