The average price of diesel in the UK passed £2 a litre on Friday 2 October, the first time the psychological and practical threshold has been crossed. The motoring organisation RAC put the record average at 200.01p, topping the previous high of 199.09p set in June 2022, and reported petrol at 174.71p and rising. The BBC and the Independent both carried the figures the same day, attributing the climb to the ongoing fallout from the US/Iran conflict that began in late February.
Rodney, the numbers behind the milestone are the part that bites. A 55-litre diesel tank now costs £110.01, some £31.70 more than it did on 28 February, the day the conflict started. For an average 45mpg diesel car, RAC head of policy Simon Williams calculated the running cost at 20p per mile, meaning a driver covering 10,000 miles a year spends £2,020 on fuel alone. "This is a pump price threshold that no-one wanted to cross," Williams said in the RAC’s announcement, adding that the price was showing no signs of slowing.
The mechanics are largely imported. The UK refines less of its own diesel than it consumes and depends on imports, many of which route through or are priced against global markets affected by the closure or threat to the Strait of Hormuz, the critical oil and gas shipping lane that the RAC notes remains unresolved with no deal in sight. US threats of a diesel export ban, reported by the BBC, could push UK prices further, because American refineries are a significant supply source for British forecourts.
There is a second, less obvious story in the RAC’s Fuel Watch data. Petrol prices are now running above what retailing trends would predict, around 174.71p against an expected average nearer 170p, which the RAC reads as retailers deliberately holding diesel a little lower by balancing the two fuels. Whether that softens the headline or simply moves the margin around, drivers pay both ways.
Businesses that live on the road face the sharpest end. The RAC named haulage and delivery firms, fleet operators and sole traders among the groups hit hardest, and warned that many will pass the additional costs to customers. That feeding into inflation is what makes the pump price a macro story: transport costs touch the price of food, fuel delivery and retail goods within weeks.
Pressure is now building on the Government ahead of October’s budget. Williams said drivers will be looking to ministers to ease the burden, through a further fuel duty cut or reduced VAT on pump sales. The Treasury has so far favoured targeted relief elsewhere, and with household energy bills also rising under the Ofgem cap, the arithmetic at the pumps has become the most visible face of a squeezed budget. Until the shipping lane reopens or the export threat lifts, £2 looks less like a milestone and more like a new floor.