Britain's 3.5 Per Cent Is Diesel at £1.92. The Bank Will Hike Because of What Sits Underneath
UK inflation rose to 3.5 per cent in September, above forecasts, on the highest petrol and diesel prices since 2022. Core inflation rose to 2.8 per cent, services to 3.7 and factory gate prices to 4.6. Two weeks before the Bank of England meets, the question is how much of this is still the pump.
The Consumer Prices Index rose 3.5 per cent in the 12 months to September, up from 3.1 per cent in August and above the 3.4 per cent economists expected, the Office for National Statistics said on Wednesday. Prices rose 0.4 per cent on the month against no change a year earlier. Transport, and motor fuels in particular, made the largest upward contribution: petrol rose 8.2p to 169.5p a litre and diesel 10.7p to 192.5p, the highest since August and July 2022 respectively. Motor fuels are 29.8 per cent dearer than a year ago. Kerosene is up 22.7 per cent. Food inflation held at 1.3 per cent, its lowest since 2021, and restaurants and hotels pulled the rate down.
The headline is an energy story, as it was in August, when Sox argued Britain's inflation problem had become a supply problem. The numbers beneath it have moved on. Core CPI, which strips out energy, food, alcohol and tobacco, rose to 2.8 per cent from 2.6. Goods inflation rose to 3.2 per cent, its highest since September 2023. Services inflation rose to 3.7 per cent from 3.4, though the ONS attributes most of that to air fares and a weak comparison with September 2025, when services prices fell 0.3 per cent in the month. Housing and household services rose 5.3 per cent on the CPI measure, with electricity, gas and other fuels making their largest contribution in a year.
The next CPI print, for October, arrives on 18 November, after both the Budget and the Bank.
From the analysisThe pipeline is the part that should worry the Monetary Policy Committee. Producer input prices rose 8.3 per cent in the year to September, from 6.7 per cent, and factory gate prices 4.6 per cent, the largest rise since April 2023. Those are the second-round effects the Bank said in September it had not yet seen. Its own forecast then was for CPI around 3.75 per cent in the fourth quarter and slightly above 4 per cent in early 2027; September has arrived early. The Committee held at 3.75 per cent by six votes to three, with three members already wanting 4 per cent and four of the six holders setting out what would change their minds. A Reuters poll before the data had 54 of 63 economists expecting a rise on 5 November. The market now treats it as near certain.
We think the Bank should raise on 5 November, and that the contrast with Canada is the reason. The Bank of Canada faces a 3.1 per cent headline with core at 1.8 and a labour market shedding jobs; Sox argued on Monday that it should hold. Britain has core at 2.8 and rising, goods inflation at a three-year high, producer prices accelerating and an economy that grew 2.1 per cent over the year to August. The energy shock is the same. The transmission is different. A quarter point to 4 per cent leaves the price of diesel where it is. What it does is show that the Committee meant what it wrote in September about persistence, and the cost of being late is a second letter to the Chancellor at a higher number.
The Chancellor gets the data a week before the Bank does anything with it. September's CPI is the reference rate for uprating working-age benefits next April, so 3.5 per cent lands in the spending numbers John Healey presents on 28 October, and the earnings and inflation figures feed the triple lock on the state pension. The IFS put the pressures on his Budget at up to £35 billion before this morning. A Budget that adds demand a week before a rate rise would be working against the Bank; one that leans on windfall taxes on the two sectors driving growth, as reported, would be working against the economy. The cheaper option on both counts remains supply: fuel duty, planning and the North Sea.
The next CPI print, for October, arrives on 18 November, after both the Budget and the Bank. Until then the facts are these: inflation has been above target for two years, the Bank's year-end forecast has been reached in September, and factory gate prices are rising at their fastest since 2023. The MPC meets in 15 days.
The Semaform
UK consumer price inflation rose to 3.5 per cent in September 2026, the highest since October 2025, driven by petrol and diesel at four-year highs, with core inflation at 2.8 per cent and factory gate prices rising 4.6 per cent, the ONS reported on 21 October.
Unlike Canada, Britain's core, goods and producer prices are all rising with the energy shock, which is the persistence the Bank said it was watching for. A rise to 4 per cent on 5 November is warranted, and the Budget should not pull the other way.
Some economists argue the services rise is a mechanical base effect from air fares, pay growth is slowing and food inflation is at a five-year low, so the Bank should look through a supply shock rather than tighten into a slowdown.
Sources
- Office for National Statistics, Consumer price inflation, UK: September 2026, 21 October 2026
- Office for National Statistics, Producer price inflation, UK: September 2026, 21 October 2026
- Bank of England, Monetary Policy Summary and minutes, September 2026
- Bank of England, Governor's letter to the Chancellor on CPI inflation, September 2026
- Yahoo Finance UK, UK inflation jumps more than expected fuelling rate hike expectations, 21 October 2026
- Mortgage Professional America, What September's higher than anticipated inflation means for mortgages, 21 October 2026
- Sox News, Canada's Core Inflation Is 1.8 Per Cent. Markets Are Pricing a Rate Rise Anyway, 19 October 2026
- Sox News, Britain's Inflation Problem Is Now an Energy Problem, 19 September 2026
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