UK Endures Largest Economic Impact Among Major Nations from Iran War

The OECD has cut its 2026 growth forecast for the UK by 0.5 percentage points. This downgrade makes Britain the most affected major economy in the wake of military activity in the Persian Gulf.

New growth numbers

The organisation now expects UK output to rise just 0.7% in 2026. That downgrade is the largest among OECD members.

The euro area and South Korea saw the next-biggest downward revisions. The update is the OECD’s first major forecast change since the Gulf conflict began.

Energy shock and trade differences

Rising crude oil prices and higher costs for jet fuel, diesel and fertilisers drove the reassessment. Those price moves will push up consumer costs, including food prices.

The UK is an energy importer and so is sensitive to gas price swings. By contrast, the United States exports hydrocarbons and may benefit economically.

Context and risk factors

The OECD warned the conflict’s duration and scope remain uncertain. Prolonged higher energy costs would raise business expenses and consumer inflation.

It also flagged a recent rise in US tariffs as an additional drag on global growth. Persistent export disruptions from the Middle East could worsen shortages and inflation.

Financial market and monetary outlook

Markets have priced in two Bank of England interest rate rises this year. The OECD, however, judged the current Bank rate of 3.75% restrictive enough.

It expects UK inflation to rise to about 4%, up from roughly 3% at the time of the report. The organisation warned of risks from weaker-than-expected AI returns and sharper market repricing.

Political response

Chancellor Rachel Reeves said the conflict will affect the country despite the UK not having started or joined the war. She argued the government’s economic plan strengthens protection against global shocks.

Her priorities included boosting regional growth, backing AI and innovation, and deepening ties with the EU.

Key takeaways

• OECD cut UK 2026 GDP forecast by 0.5 percentage points.
• UK growth now seen at 0.7% for 2026.
• Inflation forecast raised to around 4% from about 3%.
• Energy price surge is the main driver of the downgrade.
• US growth outlook improves thanks to energy exports.

Analysts at Filmogaz.com note that the broader picture includes significant downside risks. One framing put it plainly: UK Endures Largest Economic Impact Among Major Nations from Iran War.