The recent surge in UK diesel prices, reaching an unprecedented £2.00 per litre, underscores the profound vulnerability of the British economy to global energy market fluctuations. This milestone is not merely a statistical anomaly but a tangible indicator of the escalating costs faced by consumers and businesses alike. The RAC highlights that the cost of filling an average family diesel car has increased by nearly £32 since the start of the US/Iran war, now standing at £110. This substantial increase translates into higher operational costs for a wide array of sectors, from individual commuters to large logistics firms and sole traders, inevitably feeding into the prices of goods and services across the economy.

£2.00

The psychological and economic barrier of £2.00 per litre for diesel has been breached, marking a significant moment for UK fuel prices. This figure represents a substantial increase from pre-conflict levels, with the RAC noting that the cost of filling a typical petrol car has also risen by over £23 since February. The sustained upward trajectory of fuel costs, described by the RAC as "showing no signs of slowing," suggests that the financial burden on motorists and businesses is likely to persist. This situation could lead to reduced discretionary spending by households and necessitate price adjustments by companies to absorb higher transport costs, potentially exacerbating inflationary pressures already present in the economy.

Strait of Hormuz

A primary driver of the initial price surge was the effective closure of the Strait of Hormuz, a critical global waterway for oil and gas transport, at the onset of the Iran war. This disruption severely limited global supplies, pushing Brent crude prices from approximately $73 a barrel to a peak of $120 in April. While the article notes that crude flows through the Strait have since returned to pre-war levels, supported by new routes and a US military presence, the impact on refined products like diesel remains. The initial shock to the supply chain and the subsequent rerouting efforts highlight the fragility of global energy infrastructure and the immediate market reaction to geopolitical instability in key regions.

Ukraine

Beyond the Iran war, the ongoing conflict in Ukraine plays a significant role in the constrained supply of refined diesel products. Ukrainian attacks on Russian refineries have reduced Russia's output, which typically contributes to the global market. This reduction in supply is particularly problematic for the UK, which relies on imports for nearly half of its diesel needs. Unlike petrol, which the UK's four refineries produce in sufficient quantities, diesel is harder to refine, making the country more dependent on external sources. With around 31% of UK diesel imports typically coming from the US and over a third from Belgium and the Netherlands, disruptions to global refining capacity and supply chains have a direct and pronounced effect on domestic prices.