The UK Treasury has warned that escalating tensions between the US and Iran could trigger a severe economic slump.. Combined with productivity losses from extreme heatwaves,the government faces a potentail growth collapse and rising inflation.
The 0.3 per cent growth floor and the Strait of Hormuz
The UK Treasury predicts that economic growth could plummet to just 0.3 per cent by 2027 if the Strait of Hormuz remains effectively closed for the rest of the year.. According to the report, this would be the worst economic performance for Britain since 2023, the year the nation suffered a major cost-of-living crisis following Russia's invasion of Ukraine.
This projection stands in stark contrast to the 1.6 per cent expansion previously forecast by the Office for Budget Responsibility. The volatility is driven largely by the Strait of Hormuz, a critical maritime channel through which one-fifth of the world's oil and gas supplies pass, making the UK economy highly sensitive to any disruption in the Gulf.
A 4.3 per cent inflation spike and the £25 billion budget gap
Internal forecasts from the Treasury suggest that inflation could surge from the current 2.6 per cent to 4.3 per cent in the first quarter of 2027.. This spike would create a precarious situation for Chancellor John Healey and Labour leader Andy Burnham as they finalize the October Budget.
As reported, the government is considering tax increases of up to £25 billion to fund a series of ambitious spending plans. However, a growth slowdown would diminish tax receipts while simultaneously increasing the demand for welfare, potentially opening a significant hole in public finances and undermining efforts to help households manage living costs.
The £4.4 billion toll of British heatwaves
Beyond geopolitical strife, the UK is grappling with climatic shocks that are actively draining the economy. Economists at WPI Strategy estimate that recent heatwaves have already cost the UK roughly £3 billion, while the green think-tank Verdant places that figure higher, at £4.4 billion.
These extreme temperatures have crippled industrial productivity, reduced high street sales, and imperiled harvests. The resulting risk of food shortages adds a layer of domestic instability to an already fragile economic outlook, proving that climate events are now direct fiscal liabilities.
Oil at $90 and the IEA's stockpile warning
The global energy market remains volatile as oil prices hover near $90 a barrel. The International Energy Agency has warned that global oil stockpiles are depleting rapidly, a situation exacerbated by shipping disruptions in the Strait of Hormuz.
This energy instability acts as a multiplier for the domestic inflation risks facing the UK. When global commodity markets fluctuate due to conflict, the ripple effects are felt immediately in British fuel prices and manufacturing costs, further stressing the production output of British industry.
What Donald Trump's specific Iran strategy means for the Gulf
While the Treasury's warnings are dire, several critical details remain unverified. the report notes that the economy could stall if Donald Trump continues a "war on Iran," yet it remains unclear exactly what specific military or diplomatic escalations the Treasury is modeling in its 2027 projections.
Furthermore, while Treasury officials briefed Bloomberg on these risks, the report does not include a formal response from the US administration or Iranian officials regarding the current status of permanent cease-fire negotiations in the Gulf. It remains to be seen whether these forecasts assume a total blockade or a more limited series of skirmishes.
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