The short version
- Internal government modeling indicates UK GDP growth may fall to 0.3% in 2027 if Strait of Hormuz disruptions continue through late 2026.
- Inflation is projected to peak at 4.3% early next year under this scenario, significantly exceeding the Bank of England's target and current rates.
- These figures contrast sharply with previous Office for Budget Responsibility forecasts, highlighting the severe economic risk posed by ongoing Middle East tensions.
The United Kingdom’s economic trajectory for the coming year faces a significant downward revision based on internal government assessments that link domestic growth directly to geopolitical stability in the Middle East. Prime Minister Andy Burnham has been briefed on scenarios where sustained disruption in the Strait of Hormuz continues through the end of 2026, resulting in minimal expansion of the national economy next year. These projections represent a stark departure from earlier expectations and underscore the vulnerability of British commerce to international supply chain fractures.
Treasury sources have confirmed that internal models presented to the prime minister and Chancellor John Healey suggest gross domestic product growth could be as low as 0.3% in 2027. This figure is substantially lower than the 1.6% growth forecast previously issued by the Office for Budget Responsibility in March. The divergence between these estimates highlights the sensitivity of economic planning to external shocks, particularly those involving energy markets and global trade routes.
The modeling assumes a reasonable worst-case scenario in which the Strait of Hormuz remains effectively closed for approximately five months. It also presumes that no permanent peace agreement between the United States and Iran is reached before the new year begins. Under these conditions, the UK economy is projected to grow by only 0.9% over the course of 2026. This estimate falls slightly below the OBR’s March forecast of 1.1% for the current year, indicating that even immediate impacts are more severe than initially anticipated.
Inflationary pressures are expected to intensify under this scenario. The Treasury models predict that inflation will peak at 4.3% during the first quarter of next year. This stands in contrast to the current rate of 2.6%, which sits just above the Bank of England’s 2% target. The potential surge in prices reflects the broader impact of elevated oil and fuel costs, which have already begun affecting businesses following the escalation of conflict in the region.
The UK economy experienced a robust start to the year, but momentum has since stalled as Middle East tensions have disrupted commercial operations. Supply chain interruptions and rising energy expenses have created headwinds for various sectors. Official figures released on Thursday will provide updated data on economic performance between April and June, with economists anticipating growth of 0.4% for that three-month period. These quarterly results will offer further insight into how quickly the geopolitical situation is translating into domestic economic strain.
Government officials maintain that they routinely plan for a wide range of possible outcomes to ensure preparedness across different scenarios. The presentation of these specific models to top leadership indicates a serious assessment of the risks associated with prolonged regional instability. By outlining the potential consequences of a closed Strait of Hormuz, policymakers aim to understand the magnitude of support or intervention that may be required to mitigate economic damage.
The contrast between the Treasury’s current projections and earlier forecasts illustrates the rapid shift in economic sentiment. While the OBR’s March estimates offered a more optimistic view of growth for both 2026 and 2027, the new internal data suggests that geopolitical factors could severely constrain expansion. This uncertainty complicates fiscal planning and raises questions about the sustainability of current cost-of-living support measures.
Prime Minister Burnham has acknowledged that existing assistance programs may not be sufficient to address the emerging challenges. He has hinted at the possibility of further support, signaling a recognition that the economic landscape is deteriorating faster than previously modeled. As the government evaluates these worst-case scenarios, the focus remains on balancing immediate relief with long-term stability in the face of unpredictable international developments.
The implications of these forecasts extend beyond mere statistical adjustments. A growth rate of 0.3% would represent a near-stagnation of the economy, limiting job creation and wage growth. Combined with rising inflation, this scenario poses significant risks to household finances and business investment. The coming months will be critical in determining whether diplomatic resolutions can prevent these economic projections from becoming reality.
As officials await the latest quarterly growth data, the emphasis is on monitoring both domestic indicators and international developments. The interplay between Middle East politics and UK economics has become increasingly pronounced, requiring agile policy responses. The government’s acknowledgment of these risks suggests a cautious approach to future fiscal decisions, prioritizing resilience against potential shocks from global supply chain disruptions.
Sources behind this briefing
Go to the original reporting
- BBC Business↗Burnham warned of Iran war impact on UK growth next year
