UK petrol prices rose approximately 5p per litre in one week as the ongoing Iran conflict continued to disrupt global energy markets. Brent crude climbed above $100 per barrel on September 9, 2026, its highest level since July, and stood roughly 40% above its pre-war baseline of around $70. UK petrol prices have risen from about 132p per litre before the conflict to roughly 160p, adding around 15 pounds to the cost of filling a typical 55-litre tank. The conflict began on February 28, 2026, when US and Israeli forces launched strikes against Iran. A US strike on Iranian tankers in early September added to supply concerns, while threats to the Strait of Hormuz, through which roughly 20% of the world's oil and gas transits, have kept traders on edge. Refined-product shortages in diesel and jet fuel have compounded the pressure. In the US, gasoline prices reached $4.15 to $4.22 per gallon, nearly 40% above levels at the start of hostilities, while diesel approached $5.90 per gallon. The conflict is estimated to have added more than $100 billion to fuel costs for American consumers and businesses. UK motoring groups including the RAC are tracking daily pump-price movements, and the government has reportedly begun fresh discussions about fuel duty policy as it considers ways to limit further consumer pressure.