The UK service sector experienced its sharpest acceleration in cost inflation since at least 1996, according to data released on April 23, 2026. The surge is primarily attributed to a dramatic rise in fuel and energy prices resulting from the escalating war in Iran. S&P Global reported that input prices for service providers—which include banks, restaurants, and transport firms—rose at the fastest pace in three decades, complicating the inflationary outlook for the Bank of England.
The Flash UK Purchasing Managers' Index (PMI) indicated that while business activity remained in expansionary territory, the cost burden on firms has intensified. Geopolitical instability in the Middle East has disrupted global energy markets, leading to a sustained increase in crude oil prices. This has directly impacted the UK’s dominant services industry, which accounts for approximately 80% of the nation’s economic output.
Simultaneously, the Office for National Statistics (ONS) reported that UK public sector net borrowing fell to £11.9 billion in the final month of the 2025-2026 financial year. This figure represents a significant decrease from the £15 billion projected by the Office for Budget Responsibility (OBR). Total borrowing for the full year reached £120.7 billion, which, while high by historical standards, was lower than many independent forecasts. Chancellor of the Exchequer Jeremy Hunt noted that the reduction in borrowing provides some fiscal breathing room, though he acknowledged the persistent pressure of high inflation on household and business budgets.
The conflict in Iran has also had immediate repercussions for the global aviation sector. American Airlines announced on April 23 that it expects the surge in fuel prices to cost the company an additional $4 billion this year. Consequently, the airline revised its annual earnings guidance downward, now forecasting a range between a 40-cent loss per share and a $1.10 profit per share, a sharp decline from its previous estimate of $1.70 to $2.70 per share.
In response to the inflationary data, financial markets have adjusted expectations for UK monetary policy. Money market pricing now indicates that the Bank of England is expected to implement two interest rate increases of 25 basis points each before the end of 2026. This is a shift from earlier in the week, when only one rate hike was fully priced in. The anticipated 58-basis-point rise reflects growing concerns among policymakers that energy-driven inflation is becoming embedded in the wider economy.
The geopolitical situation remains the primary driver of these economic shifts. The war in Iran has led to heightened security concerns across the Persian Gulf, a critical corridor for global energy shipments. As long as the conflict persists, the volatility in energy markets is expected to maintain upward pressure on service sector costs, even as the UK government manages to narrow its fiscal deficit through lower-than-expected borrowing.