UK diesel prices have reached a record high as the ongoing conflict involving Iran continues to disrupt global energy markets.
The average diesel price reached 199.18 pence per litre on Monday, according to the RAC.
That figure surpassed the previous record of 199.09 pence set in June 2022.
The latest increase means filling an average family car with diesel now costs almost £110.
That is about £31 more than it was when the US-Iran conflict began.
Iran War Pushes Fuel Costs Higher
The rise in UK diesel prices is affecting more than motorists.
Diesel powers large parts of the transport, logistics and agricultural sectors. Therefore, higher fuel costs can increase the price of moving goods and operating businesses.
RAC head of policy Simon Williams said sustained lower oil prices would be needed before drivers see meaningful relief at petrol stations.
He also said the government could reduce fuel duty or VAT to ease pressure on motorists.
Record Prices Add to Inflation Pressure
Higher fuel costs are also creating wider economic concerns.
Fuel prices play an important role in overall inflation because transportation affects the cost of many goods and services.
The latest diesel increase comes as global refining capacity remains under pressure.
Conflicts in the Middle East and Ukraine have also disrupted fuel supplies and trade routes.
As a result, international diesel prices have climbed sharply in recent months.
UK Relies Heavily on Diesel Imports
Britain’s dependence on imported diesel adds another layer of risk.
The country now has four operating oil refineries, compared with six in 2024.
Its total crude-processing capacity has also fallen from around 1.27 million barrels per day to about 1 million barrels per day.
The UK therefore relies heavily on overseas supplies to meet domestic diesel demand.
US Export Policy Creates More Uncertainty
Global fuel markets face another potential disruption from the United States.
President Donald Trump recently backed the idea of restricting U.S. diesel exports as American fuel prices climbed.
The United States is a major diesel exporter, so any significant restriction could affect international buyers.
Europe, including the UK, could face additional competition for alternative supplies if American exports decline.
However, the White House has also pushed back against reports of an immediate export ban, while U.S. officials have warned about possible effects on domestic fuel markets.
UK Diesel Prices Remain High in Europe
Despite the record at home, Britain is not the most expensive diesel market in Europe.
RAC data showed the UK was tied with Italy for seventh place among 15 European countries on September 21.
The Netherlands, Denmark, Finland, Germany, Belgium and France recorded higher prices.
Still, the continued rise in UK diesel prices is adding to financial pressure on British households and businesses.
Lower Oil Prices Needed for Relief
The RAC said motorists are unlikely to see significant price reductions unless oil prices remain lower for several weeks.
Short-term changes in crude prices may not immediately reach petrol stations because retailers need time to sell existing fuel stocks and purchase new supplies.
For now, the record UK diesel prices highlight the wider impact of the Iran conflict on energy markets.
Higher fuel costs could continue to affect motorists, transport companies and consumers if global supply pressures persist.
