UK Diesel Hits 183.5p as Persian Gulf and Russian Supply Crunch Removes a Fifth of Seaborne Trade
ING estimates dual Iran and Russia disruptions have cut seaborne diesel volumes by around 20%, pushing UK pump prices 19p above mid-July levels.
The average price of diesel for UK motorists reached 183.5p per litre on Friday (2026-09-04), according to government data, up 19p from the 164.5p recorded in mid-July as global distillate markets tightened sharply.3,4
ING commodities analysts estimate Persian Gulf oil exports are running at roughly 50% of pre-war levels, the consequence of seven months of U.S.-Iran military exchanges that began in late February. Russian diesel — once a significant source for European markets — remains largely inaccessible under sanctions. Both disruptions together have removed around 20% of the diesel volume that normally moves by sea, ING concluded, as reported by Yahoo Finance.3
ICE Brent crude front-month surged above $97 a barrel on Thursday (2026-09-03) before retreating to $95.29 at Friday's (2026-09-04) close, a 0.24% decline that still left prices more than 6% higher for the week ending Friday (2026-09-04), Baird Maritime reported. ULSD heating oil front-month settled at $4.54 per gallon at Friday's (2026-09-04) close.4,3
For the UK, the supply dependency makes the price move particularly difficult to absorb. The United States supplied 35% of UK diesel imports in 2024, making it the single largest source, according to Energy Voice. Before the pandemic, Russian diesel had accounted for 35% of British demand; that figure fell to 27% by 2020, and sanctions have since reduced it further. In May, London relaxed those sanctions on Russian diesel and jet fuel — a concession that illustrated how limited the alternatives are when seaborne distillate flows contract sharply.1
The American position as Britain's largest diesel supplier is now under strain from the other direction. U.S. politicians are examining fuel export restrictions as domestic prices set records. The U.S. national diesel average on Thursday (2026-09-03) reached $5.78 per gallon, a rise of more than 53% from the $3.76 per gallon recorded just before the Iran war broke out in late February, according to NBC News. American refiners are already running close to capacity — Exxon reached 95% utilisation, Chevron 97% and Shell 102% in the second quarter — yet domestic demand is absorbing much of that additional output.3,2
Iraq has tried to plug part of the gap, with August oil exports reaching approximately 2.34 million barrels per day, up from roughly 1.35 million bpd in July, two Iraqi energy officials told Baird Maritime on Wednesday (2026-09-02). The gain is substantial but has not been sufficient to restrain distillate markets.4
The tightness is showing up in crime statistics as well as pump prices. Fuel theft in the UK rose 48% in the five months after the Iran war began compared with the equivalent period before it, the BBC reported, and the frequency of incidents climbed a further 24% since then. Those figures predate Friday's (2026-09-04) government price reading.2
Three senior Iranian sources told Baird Maritime that U.S. efforts to blockade Iranian oil exports and halt sanctions evasion are growing increasingly difficult to sustain — a development that, if it holds, would eventually ease Gulf throughput. Energy Secretary Chris Wright told CNBC on Wednesday (2026-09-02) that more than 17 million barrels of oil transited the Strait of Hormuz on Monday (2026-08-31) under U.S. military protection, a wartime record. Losing American volumes while Persian Gulf flows remain halved and Russian barrels stay off limits would leave the UK without a substitute for roughly a third of its diesel needs.4,3,1