UK inflation jumps as war-driven fuel costs push consumer prices higher, with the Office for National Statistics reporting on Wednesday that annual CPI inflation rose to 3.5% in September 2026, up from 3.1% in August and the highest reading since October 2025. According to ABC News (abcnews.com), the figure came in above the 3.4% most economists had expected, taking inflation further above the Bank of England's 2% target.
The immediate cause is fuel. Motor fuels rose 30% in the year to September, up from a 23% annual increase in August, as the Iran war and bottlenecks in the Strait of Hormuz squeezed global oil and gas supplies, ABC News reported. Euronews (euronews.com) noted that average diesel prices in September reached their highest level since July 2022, and that transport prices rose 6.6% year on year, up from 4.6% the previous month, making motor fuels the largest upward contributor to the change in annual inflation.
The pressure is not confined to the pump. Services inflation accelerated to 3.7%, core CPI rose to 2.8% from 2.6%, and housing and household services and communication costs rose 5.3% and 5.8% respectively, according to Euronews. Food inflation was unchanged at 1.3%. On the month, consumer prices rose 0.4% after a 0.5% increase in August.
A Budget squeezed from both sides
The reading lands one week before the Labour government presents its annual budget on 28 October, a statement expected to address cost-of-living pressures. Treasury chief John Healey said the budget would aim to give businesses and families "some breathing space" from the rising cost of living, ABC News reported. The public finances make that harder. Public sector net borrowing was £24.5bn in September, £1.8bn more than a year earlier and above market expectations, the ONS said, as spending including higher debt interest costs rose faster than government income, partly reflecting inflation. Borrowing between April and September reached £97.8bn, or 3.1% of GDP, which Euronews reported was £6bn more than the Office for Budget Responsibility's forecast. Public sector net debt exceeded £3 trillion for the first time, though at 94% of GDP it was down from 94.7% a year earlier. BBC News (bbc.co.uk) framed the numbers as the chancellor's balancing act in clear terms: debt above £3 trillion, inflation at 3.5% and "surely heading back up to 4% in the coming months", and borrowing running ahead of forecasts. Its economics editor, Faisal Islam, noted that UK borrowing costs have risen alongside most of the advanced world as the US-Israel war against Iran has intensified, with 10-year gilt yields just below 5.4% at the end of September after a 19-year high earlier that month, according to Euronews.Why the Bank of England is expected to move
The Bank of England is widely expected to raise interest rates at its meeting on 5 November, which would be its first increase since 2023. Its benchmark rate stands at 3.75%. ABC News reported that most economists expect a move to 4%, while Euronews cited Danni Hewson of AJ Bell saying market expectations of a November increase were "nearing 100%, with more than a 50% chance that a second hike will follow before the end of the year". Suren Thiru, chief economist at ICAEW, told ABC News: "With inflation increasing, the pieces are falling firmly into place for a November rate rise." The Bank watches services and core inflation closely, and both rose. BBC News reported that Capital Economics now expects the main measure of inflation to peak at 4.2% next year, and pointed to airfares and computer game download prices as early signs of stickier price pressure. Rate rises elsewhere matter too: the European Central Bank and the US Federal Reserve have raised rates recently, according to both Euronews and ABC News. UK rates had been falling from a 15-year high of 5.25% until the US and Israel attacked Iran in late February, ABC News reported.Who is affected
The inflation figure is not only a market signal. BBC News noted that it sets the uprating for tens of billions in welfare payments next April, because benefits such as personal independence payment and carer's allowance must rise in line with September's CPI. It also confirms that the Triple Lock will lift the State Pension by 3.9% next April. Frozen tax thresholds will raise more tax in cash terms, the BBC added, while higher inflation also raises the cost of public services, including likely union pay demands. For companies, the transmission runs through three channels. Consumer confidence is one: Hewson said the knowledge that "funding our lives is only going to get harder in the coming months will impact consumer confidence", according to Euronews. Input and transport costs are another, with Hewson pointing to rising service costs and higher raw material prices on top of transport. Financing costs are the third, with gilt yields near 5.4% feeding through to corporate and mortgage pricing.What is still unknown
The scale of any Budget support, and whether it is targeted at fuel, benefits or business rates, is not yet public. Whether the fuel-driven rise proves temporary is contested: food inflation was largely unaffected by the energy shock, the BBC noted, but services and core measures moved up. The path of the Iran war and the Strait of Hormuz bottlenecks remains the largest single variable, and none of the sources offers a resolution timeline. The Bank's November decision is expected but not certain, and the size of any further move this year is a market expectation rather than a commitment.Sources and References
- Euronews — UK inflation jumps more than expected fuelling rate hike expectations (euronews.com)
- ABC News — UK inflation rise to highest in almost a year as Iran war drives fuel prices higher (abcnews.com)
- BBC News — Faisal Islam: Inflation and borrowing figures illustrate chancellor's Budget challenge (bbc.co.uk)
