UK Diesel Stays Near Record £2 Despite Falling Oil — Refining Bottlenecks and Forecourt Margins Do the Extracting

Oil prices dropped, petrol followed. Diesel barely moved. The gap exposes a structural extraction chain: Middle East chokepoints, limited refining capacity, and forecourt operators slow-walking wholesale savings.

UK diesel remains at 197p per litre — just 3p below October's all-time record of £2 — even as crude oil prices have fallen significantly. Petrol, by contrast, has dropped 6p from its October peak of 174.7p to 168p. The divergence is not random. It traces a specific extraction chain from geopolitics through refining bottlenecks to the pump.

The geopolitical mechanism is explicit. US Federal Reserve governor Christopher Waller told a London conference that increased tanker traffic through the Strait of Hormuz now carries a premium of $20 to $30 per barrel, driven by insurance costs and ship-to-ship oil transfers designed to guard against Iranian attacks. That premium bakes directly into the price of refined diesel, which is more sensitive to supply disruption than petrol. Refining capacity is the second chokepoint. Waller stated that limited refining capacity and other constraints are suppressing diesel production specifically, adding that elevated US diesel prices "are not expected to moderate as readily as crude oil prices would in a more peaceful Middle East." The UK faces the same structural exposure — diesel is harder to produce, and the refining margin stays fat even when crude drops. The third layer is forecourt behaviour. The AA reports wholesale unleaded costs fell from 77p to below 62p per litre since mid-October — a 15p drop — while retail petrol fell only 6p. The wholesale diesel cost dropped roughly 4p, and the retail price moved just 2p. Forecourt operators are pocketing the difference, and the AA called the situation "dismal" and pricing behaviour by some retailers "unforgivable." Geographic inequality compounds the extraction. AA spokesperson Luke Bosdet noted that bargain petrol below 160p is available in northern England, Wales, and Scotland, but "London and the south-east stand out for not showing any fuel stations with the bargain petrol prices." Some forecourts still charge near October's peak. Competition — or the lack of it — determines who pays more. The practical cost is concrete. Each 5p reduction at the pump saves £2.75 on a typical 55-litre fill. The AA says another 10p drop for petrol is plausible given wholesale trends. For diesel, the outlook is grimmer: the structural constraints that keep it elevated are geopolitical and industrial, not seasonal or speculative. The pattern is clear: when oil falls, diesel prices stick. The value destroyed at the crude level is recaptured at the refining and retail layers. Households and businesses — especially those dependent on diesel for transport and logistics — bear the full cost of a supply chain designed to preserve margins at every intermediate step.