British diesel crossed the £2-per-litre threshold on Friday, a record that crystallizes four months of cascading energy pain since the US-Israel war on Iran began disrupting Gulf oil flows in late February. The RAC confirmed the average hit 200.01p, meaning a typical family diesel fill-up now costs £110 — nearly £32 more than before the conflict. Petrol is tracking the same curve at 174.1p, up 31.5%. The proximate cause is a global refinery capacity crisis, not just crude supply. Before the Ukraine war, Russia supplied 10-15% of the world's diesel. Another 10% transited the Strait of Hormuz from Gulf producers before Iran began disrupting the strait in retaliation for US-Israeli strikes. Two major supply arteries are now simultaneously impaired, and refinery damage in both the Middle East and Russia has throttled output of refined product faster than crude markets can adjust. Britain's specific vulnerability is stark. The UK sources roughly 30% of its diesel from the United States, with the bulk from mainland Europe. Trump has now weaponized that dependency, threatening to cut US diesel exports unless Germany and France release their strategic stockpiles to ease global prices. Transport minister Keir Mather insisted Friday there is no shortage, but the 42-day reserve buffer is a thin cushion against a sustained supply disruption. The diplomatic scramble is already underway. The UK opened talks with European allies Thursday about releasing emergency supplies. EU Energy Commissioner Dan Jørgensen confirmed Friday that Europe is discussing diesel reserves with all IEA members, not just the US. Trump, meanwhile, has pressured Zelenskyy to halt Ukrainian drone strikes on Russian refineries — effectively asking Ukraine to sacrifice a strategic weapon to relieve a fuel crisis partly of Washington's own making. The cost transmission is relentless and regressive. Haulage firms, delivery companies, sole traders, and long-distance commuters — the people who chose diesel precisely for fuel economy on high-mileage journeys — are absorbing the steepest increases. The RAC's Simon Williams called it "a cruel twist" that diesel, once the cost-effective choice, is now the most expensive fuel at the pump. Household energy bills are compounding the squeeze. The quarterly price cap rose 4% this week to £1,723 annually, with Cornwall Insight forecasting a further 16% increase to £1,999 — adding £276 to the average dual-fuel bill. Road fuel inflation and home energy inflation are now hitting simultaneously, driven by the same upstream supply disruptions. The structural picture is clear: Britain built its energy security on diversified imports rather than domestic capacity, and that diversification has failed simultaneously across multiple vectors. US supply is now a geopolitical lever. European supply depends on Russian refinery output. Gulf supply transits a war zone. Every leg of the stool is wobbling at once, and the consumer is the one sitting on it.
