UK inflation accelerated to 3.5% in September 2026, up from 3.1% in August, as surging motor fuel costs added to household price pressures. The figures released on October 21 exceeded economists’ forecast of 3.4%, with markets pricing in a near-certain Bank of England interest-rate increase in November.
Key Takeaways
- Annual motor fuel inflation reached 29.8%, its highest rate since August 2022.
- Core and services inflation also accelerated, showing price pressures extended beyond energy.
- Markets priced a 98% chance of a quarter-point November rate increase, not a confirmed policy decision.
Table of Contents
- UK inflation rises as motor fuel costs surge
- Markets anticipate a November rate increase
- Autumn Budget faces competing pressures
- Conclusion
UK inflation rises as motor fuel costs surge
The ONS September consumer price bulletin showed annual CPI inflation at its highest since October 2025. Consumer prices rose 0.4% over the month, compared with little change in September 2025.
Transport, particularly motor fuels, made the largest upward contribution to the change in annual inflation. Fuel prices were 29.8% higher than a year earlier, accelerating from 23.0% in August. Restaurants and hotels provided the largest partial offset.
The increase continued a reversal from the summer: annual CPI inflation had been 2.9% in July before rising in August and September. September’s reading was 0.4 percentage points above August’s rate.
The broader picture also strengthened. Core CPI, which excludes energy, food, alcohol and tobacco, rose to 2.8% from 2.6%. CPI services inflation increased to 3.7% from 3.4%, meaning the acceleration was not confined to fuel.
| Item | Details |
|---|---|
| Average petrol price | 169.5 pence per litre in September 2026, up 8.2 pence from August. |
| Average diesel price | 192.5 pence per litre in September 2026, up 10.7 pence from August. |
| CPIH inflation | The measure including owner-occupiers’ housing costs rose to 3.6% annually, from 3.3% in August. |
| Food and non-alcoholic beverages | Annual inflation held at 1.3%; prices fell 0.2% over the month. |
Markets anticipate a November rate increase
LSEG data on October 21 showed markets pricing a 98% probability that the Bank of England would raise its key rate by 25 basis points to 4% in November. Most traders also priced in another increase of the same size at the final meeting of 2026 in December.
Those prices reflect market expectations rather than a commitment by policymakers. Sterling was broadly unchanged against the euro and US dollar following the release, while UK government bond yields also showed little movement.
Scott Gardner, investment strategist at J.P. Morgan Personal Investing, said policymakers would look beyond the headline figure. He pointed to accelerating services inflation as a concern that energy-related pressures could be spreading more widely through the economy.
Autumn Budget faces competing pressures
The inflation release also raised the stakes for the Autumn Budget, scheduled for the following week. Separate figures published on October 21 estimated that UK national debt had exceeded £3 trillion in September for the first time.
Chancellor John Healey said he would maintain fiscal discipline while seeking to support growth and give businesses and families breathing space.
Suren Thiru, chief economist at the Institute of Chartered Accountants in England and Wales, said rising prices increased pressure for cost-of-living support while higher borrowing costs narrowed the government’s options. In his assessment, the Budget needed to avoid adding further inflationary pressure.
Conclusion
UK inflation strengthened both at the headline level and in underlying measures, reinforcing expectations of tighter monetary policy. The next scheduled developments are the Autumn Budget the following week and the Bank of England’s November decision; the next ONS consumer-price release is due on November 18, 2026.
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