AI-assisted research analysis by FutureKnowledge. Sources checked 21 October 2026. This is not investment advice.
Reviewed by FutureKnowledge: figures, dates and attributions were checked against the linked sources before publication.
UK inflation rose to 3.5% in September from 3.1% in August, the Office for National Statistics said on 21 October, as a near-30% annual jump in motor fuel prices pushed the consumer price index to its highest rate in almost a year. The reading came in above the 3.4% that economists had expected, according to Investing.com, and it leaves the Bank of England close to certain to raise interest rates on 5 November.
What the UK inflation figures show
The ONS bulletin shows consumer prices rose 0.4% in the month, against almost no change in September 2025, which is why the annual rate jumped so sharply. The broader CPIH measure rose to 3.6% from 3.3%.
- Core CPI, which strips out energy, food, alcohol and tobacco, rose to 2.8% from 2.6%; Investing.com put the consensus at 2.7%.
- Services inflation, the measure the Bank watches most closely, rose to 3.7% from 3.4%, and goods inflation to 3.2% from 2.7% (ONS).
- Food and non-alcoholic drinks stayed at 1.3%, far below the headline rate.
- Transport was the largest upward contributor, with its annual rate rising to 6.6% from 4.6%. Restaurants and hotels pulled the other way, easing to 3.8% from 4.1%.
The fuel numbers are the heart of the story. The ONS says motor fuel prices were 29.8% higher than a year earlier, up from 23.0% in August. Average petrol rose 8.2p a litre in the month to 169.5p, the highest since August 2022, and diesel rose 10.7p to 192.5p, the highest since July 2022. MoneyWeek cites higher pump prices from a different survey; this article uses ONS data. Investing.com adds that heating oil inflation jumped to 105% from 65%, and that fuel and heating oil together added about 0.2 percentage points to the headline rate.
Why inflation is rising again
The driver is the oil shock linked to the Middle East conflict. When the Bank of England’s Monetary Policy Committee held Bank Rate at 3.75% on 17 September, it noted that Brent crude had reached $106 a barrel and UK wholesale gas 207p a therm, and said energy accounted for about 0.7 percentage points of the 1.1-point overshoot of its 2% target in August. Oil has since risen further: FutureKnowledge reported today that Brent hit a five-month high above $110 as tanker attacks spread.
Inflation has now risen for three months in a row, from 2.9% in July, according to BigGo Finance. JPMorgan economist Scott Gardner told that outlet the rebound has wiped out the disinflation gains made in the spring, and that services prices, not fuel, are the bigger worry because they signal possible second-round effects. Investing.com reports that Capital Economics sees tentative signs of energy costs feeding into other prices, while ING’s James Smith sees no such sign yet and says the services jump was exaggerated by volatile airfares.
What it means for the Bank of England and UK interest rates
The September vote was already split 6-3, with Megan Greene, Catherine Mann and Huw Pill voting to raise rates to 4%, according to the Bank’s minutes. The Bank projected CPI of around 3¾% in the fourth quarter and slightly above 4% in the first quarter of 2027. Core and services numbers came in hotter than expected.
Markets price about a 98% chance of a quarter-point rise to 4% at the next meeting, BigGo Finance reports, with most traders expecting another rise in December. IndexBox notes that a November move would be the Bank’s first rate rise since 2023. Forecasters disagree on how far rates go: Capital Economics expects a peak of 4.25%, below the 4.75% to 5% it says markets anticipate, while ING expects a further rise in February followed by cuts by next November (Investing.com). The pound and gilt yields moved little, BigGo Finance reports.
The Budget squeeze
The data lands a week before the 28 October Budget. Public sector borrowing was £24.5bn in September, above the £23.9bn consensus and the Office for Budget Responsibility’s March forecast of £22.5bn (Investing.com). CPA’s daily briefing puts April-to-September borrowing at £97.8bn, about £6bn above the OBR forecast, and September debt interest at £10.9bn. ICAEW’s Suren Thiru told MoneyWeek it turns the Budget into a “perilous high-wire act”. Separately, the Bank of England agreed in September to keep running down its gilt holdings, including sales of £20bn a year, which adds supply to the bond market.
How it affects India and businesses
For India, the direct links are limited but real. The same oil shock is hitting India’s import bill, which FutureKnowledge reported jumped to $90.6 billion in April-September. Higher UK rates would raise borrowing costs for Indian firms that fund or own businesses in Britain, and could squeeze spending by UK households, a market for Indian exporters under the new trade pact (see our report on the Scotch duty probe under the UK trade pact).
Who is more or less exposed
- More exposed: UK mortgage holders coming off fixed deals, heavy road-freight users, airlines, and businesses with floating-rate debt in sterling.
- Less exposed or partly cushioned: savers and lenders with deposit-funded books, which tend to gain from higher rates, and households whose food bills are rising slowly, given food inflation of 1.3%.
Scenarios to watch
These are conditional scenarios, not predictions.
| If this happens | Possible effect |
|---|---|
| Oil stays above $105 and diesel keeps rising | Headline CPI could approach the 4% to 4.2% peak some forecasters expect, and the case for more than one rate rise strengthens |
| Services inflation falls back as airfares normalise | The Bank could stop after a November rise, closer to the Capital Economics view of a 4.25% peak or lower |
| The 28 October Budget tightens fiscal policy sharply | Weaker demand could ease pressure on the Bank to keep raising rates |
| Energy prices fall in early 2027 | The January energy cap rise could be smaller, and ING’s path of cuts by late 2027 becomes more plausible |
What to watch next
- The UK Budget on 28 October and the OBR’s revised borrowing forecasts.
- The Bank of England decision and new projections on 5 November.
- October inflation data, due from the ONS on 18 November.
- Brent crude and diesel prices, which have driven most of the rise.
Bottom line
UK inflation at 3.5% is mainly a fuel story, but the rise in core and services inflation is what turns it into a rate story. A November rise to 4% now looks almost fully priced; the open question is whether energy costs spread far enough into wages and services to force the Bank into a longer tightening cycle.
Method note: This analysis compared the ONS September 2026 consumer price inflation bulletin and the Bank of England’s September 2026 Monetary Policy Summary and minutes (primary sources) with reporting from Investing.com, MoneyWeek, BigGo Finance, IndexBox and CPA. Where pump-price figures differed, ONS data were used.