The Bank of England is confronting one of its toughest policy dilemmas in years after UK CPI inflation unexpectedly ticked higher to 3.3% in the 12 months to March 2026.
The rise, driven largely by surging petrol prices linked to the war in Iran, has already prompted markets to price in a quarter-point rate hike by the end of the summer, and it is forcing Threadneedle Street to weigh the risks of acting too aggressively against the dangers of doing too little.
The Monetary Policy Committee (MPC) voted unanimously in March to hold Bank Rate at 3.75%, signalling it was ‘ready to act’ if the conflict-driven price shock proved persistent. This week’s data will only intensify that debate ahead of the MPC’s next meeting on 30 April.
A classic supply shock meets a softening labour market
The March CPI rise was propelled mainly by higher transport costs, particularly motor fuels. The average price of unleaded petrol increased from £1.32 per litre in February to £1.40 in March, a 6.5% jump, and has since climbed further to around £1.58. That recent momentum alone will feed into higher inflation readings in the coming months.
Yet this represents only the early stages of the shock. Food prices typically take up to 12 months to fully reflect shifts in global commodity costs, while domestic energy bills are reset by Ofgem in July and again in October. Both categories are expected to deliver additional upward pressure later in 2026.
“The inflation figures show the first impact of the war on British household budgets, but further rises in food and energy bills are still to come,” said Resolution Foundation Chief Economist James Smith.
“The timing matters: petrol tracks global prices very promptly, but food price rises can take a year to fully feed through, and energy bills will not rise decisively until the colder months. That means inflation is likely to remain elevated through the rest of the year, albeit at much lower rates than seen after Russia’s invasion of Ukraine.”
The inflationary pulse is a classic supply shock caused by disrupted shipping routes and tighter global energy supplies, not excess domestic demand.
Higher interest rates cannot quickly restore oil flows or repair supply chains, but they can further restrain an already weakening economy.
Weakening labour market gives the Bank room for patience
Compounding the MPC’s challenge is a softening jobs market. Early estimates show payrolled employment fell by 65,000 (0.2%) in the year to March 2026, with a monthly decline of 11,000.
Economic inactivity has risen in some measures, wage growth is easing, and vacancies continue to trend lower.
The combination of rising prices and moderating earnings is eroding real household purchasing power at a vulnerable moment.
“A rise in rates risks misdiagnosing the problem. This inflationary pulse is being driven by supply disruption, not excess demand. Higher interest rates will do nothing to increase the flow of oil or other goods from the Middle East,” said Lindsay James, Investment Strategist at Quilter.
“Financial markets are behaving as though the conflict is effectively over, with equity markets largely recovered and oil prices for future delivery falling from around $95 for June contracts to closer to $80 by year end.
“The physical market tells a very different story. Prices for immediate delivery into Europe are trading roughly $28 above benchmark levels, reflecting transport disruption rather than longer‑term demand.”
Even if the conflict were to end quickly, the data underline that an inflationary effect already feeding through the economy and will continue to do so over the coming months, James said.
“A rapid reopening of the Strait could allow current rate‑hike expectations to unwind, but whether this becomes something more persistent, and harder for markets to look through, depends entirely on how long supply chains remain impaired.
“The problem is that this inflation shock is landing as the domestic economy is weakening. Recent labour market data show payrolled employment falling, inactivity rising and wage growth easing. Rising prices alongside weakening earnings growth is a clear recipe for declining real purchasing power.”
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