UK petrol prices climbed to an average of 160p per litre on 31 July 2026, the highest level since November 2022, as the US-Iran conflict pushed Brent crude (the benchmark oil price that sets the cost of fuel worldwide) above $90 a barrel. Diesel rose to 179p per litre over the same period, up 14.5p, though it remained below the April 2026 high of 192p. The RAC, which compiled the pump-price data, said filling a typical family-size car with unleaded now costs £88 (The Guardian).

The price surge follows a brief reprieve earlier in July. Petrol had dropped to 151p per litre after a Middle East ceasefire announcement before climbing back to 160p — a 9.38p increase that The Guardian characterised as a new "Iran War high" (The Guardian). The reversal came as the United States struck Iran multiple times in the days preceding 31 July, according to The Guardian's reporting. Brent crude rose more than 1% on the day to settle above $90.

Simon Williams, the RAC's head of policy, described the outlook as "pretty grim" and said it looked "highly likely that a litre of petrol will surpass 160p" (Yahoo Finance UK). Williams separately projected that diesel would probably reach 185p per litre in the coming weeks, barring a major reduction in oil prices (The Guardian). BBC News corroborated the 160p figure, reporting it as the highest petrol price since the Iran war began (BBC News).

The timing compounds the pressure on households. AA spokesperson Luke Bosdet said AA polling indicated 20.5 million UK drivers would take to the road in the third week of the holiday season, a period when fuel demand typically peaks (The Guardian). When geopolitical supply shocks coincide with seasonal demand, there is little downward pressure on prices at the pump.

One structural change since the last comparable price spike is the UK government's Fuel Finder scheme, which requires all petrol stations to report prices publicly. Enforcement began in May 2026. The scheme is designed to improve price transparency and let consumers shop around, though its capacity to hold down prices during a supply-driven surge is an open question.

The ripple effects extend beyond the UK. Euronews reported in May 2026 that fuel prices across Europe rose rapidly following the US-Israel strike on Iran, with Spanish petrol prices climbing 18% from €1.59 to €1.88 per litre (Euronews). Euronews also cited a Reuters article from 1 March 2026 on US gasoline prices in the context of the Iran war, placing the American retail fuel experience within the same geopolitical pricing matrix.

The RAC publishes ongoing fuel price tracking on its Fuel Watch page (RAC Fuel Watch), and a European comparison page last updated 13 July 2026 shows UK pump prices alongside continental benchmarks (RAC European Fuel Prices). The RAC's media site has carried successive statements on the trajectory of fuel costs, including a 20 July 2026 release framing the rises as evidence of how exposed UK drivers are to global oil market events (RAC Media).

The broader context here is a pricing chain that moves from military escalation to crude markets to petrol station forecourts with considerable speed. The July trajectory illustrates this compression: a ceasefire announcement depressed prices to 151p, and renewed strikes reversed the decline within weeks. For UK households, the £88 fill-up cost arrives alongside a diesel trajectory that, on the RAC's own modelling, points toward 185p. The Fuel Finder scheme offers transparency but no price ceiling. With 20.5 million drivers preparing for peak holiday travel, demand-side relief is unlikely in the near term. The variable most likely to alter the trajectory is the one least predictable: the pace and intensity of US-Iran hostilities and their knock-on effect on Brent pricing.