The United Kingdom's annual consumer price inflation rose to 3.5% in September 2026, according to data released Wednesday by the Office for National Statistics (ONS). This figure represents an increase from the 3.1% rate recorded in August and exceeded the 3.4% median forecast by economists in a Reuters poll. The ONS attributed the rise primarily to higher costs for petrol and diesel.
The reported increase follows a period of heightened energy price volatility. Analysts cited a surge in energy prices, influenced by conflict in the Gulf, as a factor in the September data. Britain’s reliance on imported natural gas has left it more exposed to these fluctuations than many other Western nations. The Bank of England had previously forecasted a smaller rise to 3.0% in its July projections.
Beyond fuel costs, underlying price pressures also intensified. Services price inflation, a key indicator for the Bank of England, reached 3.7% in September, up from 3.4% in August. Core inflation, which strips out volatile items like food, energy, alcohol, and tobacco, rose to 2.8% from 2.6%. These figures have led to increased expectations that the central bank may raise interest rates during its November meeting.
In a separate reporting cycle from May 2025, inflation also reached 3.5% following what was described as "awful April." During that period, price increases were driven by a 26.1% rise in water and sewerage bills, the sharpest since privatization, alongside higher energy costs and council tax. The April 2025 data also reflected the impact of a higher national minimum wage and increased employer national insurance contributions on business costs.
The rise in inflation to 3.5% directly affects the purchasing power of all UK households and the operational costs for small-business owners. For a typical household, these figures represent a 0.4 percentage point increase in the annual rate of price growth in just one month, primarily driven by transport and energy costs. Renters and homeowners alike may face higher expenses as the Bank of England considers raising interest rates in November to curb these pressures.
Small-business owners are experiencing rising costs. According to the British Chambers of Commerce in April 2025, 55% of businesses surveyed expected to raise their own prices to compensate for higher utility bills and tax contributions. While pay has grown faster than prices for the last two years, economists suggest this trend may slow as companies alter hiring plans to manage higher national insurance requirements.
The next significant developments occur on two fronts. Finance Minister John Healey is scheduled to deliver his first budget next week, where he is expected to address calls for household support. Shortly after, the Bank of England’s Monetary Policy Committee will meet in November to decide whether to increase interest rates from their current levels. Financial markets have already adjusted forecasts, suggesting that previously anticipated rate cuts may now be delayed.