UK Inflation Jumps to 3.5% in September as Fuel Prices Hit a Four-Year High

UK consumer prices rose 3.5% in the 12 months to September, up from 3.1% in August, the Office for National Statistics said on Wednesday 21 October. That is the highest annual rate since October 2025. Prices rose 0.4% in the month alone, against almost no change in September last year, and the gap between those two monthly moves explains most of the jump.

Fuel led the way. Petrol averaged 169.5 pence a litre in September and diesel 192.5 pence, both the highest since the summer of 2022, and motor fuel prices were 29.8% higher than a year earlier. The rise was not confined to the pump. Core inflation, which leaves out energy, food, alcohol and tobacco, climbed to 2.8% from 2.6%, and services inflation, the measure the Bank of England watches most closely, rose to 3.7% from 3.4%.

Sterling barely reacted at first. GBP/USD touched 1.3381 in the first minutes after the 06:00 UTC release, slipped to 1.3366 within ten minutes and was back near 1.3377 at 06:30 UTC. EUR/GBP briefly dipped to 0.8382 and returned to about 0.8389. A move that small suggests the jump in fuel prices, visible at the pump for weeks, did not change many minds about the Bank of England on its own. The pound firmed later in the London morning, and GBP/USD stood near 1.3398 at 10:00 UTC.

What the ONS reported

Two measures sit at the top of the release. CPI is the target measure for the Bank of England, whose goal is 2%. CPIH adds the costs of owning a home, which make up about 18% of that index, and the ONS calls it its most comprehensive measure. Both moved up sharply: CPIH reached 3.6% from 3.3%, and owner occupiers' housing costs rose 4.0%, up from 3.9%.

Six of the twelve spending categories pushed the annual rate higher, and three pulled it lower. Transport made the largest upward contribution, with recreation and culture and housing and household services also adding to it. Restaurants and hotels did the most to offset the rise, as hotel prices grew more slowly than a year earlier.

Goods and services both sped up. CPI goods inflation rose to 3.2% from 2.7%, and on the CPIH measure goods inflation hit its highest rate since September 2023, mostly because of motor fuels and kerosene. CPIH services inflation reached 3.9%, with the largest push from transport services, particularly air fares.

Fuel drove the jump

Transport prices rose 6.6% over the year, up from 4.6% in August. Petrol went up 8.2 pence a litre between August and September, while a year earlier it fell 0.2 pence. Diesel rose 10.7 pence, against a fall of 0.4 pence in September 2025. Monthly rises of that size feed straight into the annual rate, because last year's comparison month was flat.

Air fares added to the push in a less obvious way. Fares fell 19.5% between August and September, as they usually do after the summer holidays, but the drop was smaller than last year's 28.8% fall, so the annual rate rose. The ONS said the effect came mainly from European routes. It also noted that all flight prices it has collected since 28 February were gathered after the outbreak of the conflict in the Middle East.

Heating oil jumped as well. Kerosene prices rose 22.7% in the month, against a 1.4% fall a year ago, which added to the housing category.

Source: Office for National Statistics, Consumer price inflation, UK: September 2026. Annual rates, 12 months to the month shown.

Services and core prices rose too

A fuel-driven rise is something a central bank can sometimes look past, because oil prices can fall as quickly as they rise. The harder part of this report is the rest of the basket. Core CPI rose by 0.2 points to 2.8%, up from 2.6% in August, and services inflation rose by 0.3 points to 3.7%.

Some of that came from one-off timing. Recreation and culture prices rose 0.7% in the month, led by live music, where prices edged up this year after falling 8.6% a year ago, and by computer game downloads, up 40.0%. Package holidays and cultural events added smaller amounts. Swings like these often unwind the following month.

Food went the other way. Prices for food and soft drinks were 1.3% higher than a year earlier, the same rate for a third month; it was last lower in September 2021. The ONS pointed out that groups such as the Food and Drink Federation expect food inflation to arrive later and last longer, as manufacturers struggle to pass higher costs on.

What it means for the pound and the Bank of England

The Bank of England held Bank Rate at 3.75% on 17 September, with six members voting to hold and three wanting a change. Its next decision is on 5 November, and this report makes a cut much harder to argue for. Inflation is now 1.5 points above the 2% target and rising, and the measures that reflect domestic pressure, services and core, both moved up.

Tuesday's jobs data offered some balance. The ONS said unemployment fell to 4.7% but vacancies dropped to 691,000 and total pay growth slowed to 3.7%, and private sector regular pay grew only 3.0%. Slower wage growth should, in time, cool services prices. Until it shows up in the inflation data, though, the Bank is likely to focus on today's numbers.

For sterling, firmer inflation usually means higher rate expectations, which tends to support the currency against the dollar and the euro. The risk is that energy-driven inflation also squeezes spending and growth, which would limit how far the pound can rise. September retail sales, due at 07:00 UK time on Friday, will show how households are coping.

What traders can take from it

A hot inflation number can move the pound fast, but the follow-through depends on what is driving it. These points help keep the release in proportion.

• Look at services and core as well as the headline. Fuel explains most of the jump, but services at 3.7% and core at 2.8% are what move Bank of England expectations.
• Watch oil. Petrol and diesel are at four-year highs, and a fall in crude would take pressure off next month's figure quickly.
• Expect base effects in the months ahead. Last year's October CPI rose 0.4% in the month, so the comparison gets tougher from here.
• Read EUR/GBP as well as GBP/USD. A rise in the pound against the euro shows the move is about UK data, not just the dollar.
• Keep size small before Friday's retail sales and the 5 November decision. Two more UK events can shift the view on rates before the Bank meets.

For today's levels, see our GBP/USD analysis. Yesterday's UK jobs story covers the labour market data, and the economic calendar lists every release before the Bank of England meets. Size each trade with the position size calculator.

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Sources: Office for National Statistics: Consumer price inflation, UK: September 2026 · Office for National Statistics: Consumer price inflation, UK: August 2026 · Bank of England: Bank Rate · Office for National Statistics: Labour market overview, UK: October 2026