How Global Oil Markets Work and Why Wars Drive Up Your Petrol Bill

How Global Oil Price Is Set

Crude oil is not bought and sold like a supermarket product with a fixed shelf price. It is traded continuously on global commodity exchanges — primarily the Intercontinental Exchange (ICE) in London and the New York Mercantile Exchange (NYMEX) — where the price is set by the interaction of buyers and sellers responding to real-time information about supply, demand, and risk.

The benchmark crude used for European and global pricing is Brent crude — a blend of North Sea oil grades. The price you see quoted as "oil price" in the news is invariably the Brent crude price in US dollars per barrel. West Texas Intermediate (WTI) is the US benchmark and typically trades $2–5 below Brent. Every petrol station price in the UK is ultimately derived from the Brent price, filtered through refinery margins, transport costs, duty, and retail markup.

Futures Markets Explained

The critical insight about oil markets is that most trading is not for immediate physical delivery — it is in futures contracts, agreements to buy or sell oil at a specific price on a specific future date. When you see oil rise $5/barrel on news of a Middle East conflict, that is typically the price of a contract for delivery 1–3 months hence. Markets are essentially betting on what supply and demand will look like in the future, incorporating the probability and severity of disruption.

This forward-looking nature explains why petrol prices can rise immediately when conflict news breaks — before a single extra barrel has been affected. If the market thinks there is a 30% chance that the Iran conflict will reduce supply by 2 million barrels per day, it prices in a risk premium reflecting that probability today. This risk premium can be reversed very quickly if the conflict de-escalates — which is why pump prices sometimes drop sharply with ceasefire news.

How Wars Move Oil Prices

Wars affect oil prices through four distinct channels. Supply disruption is the most direct: if military action damages oil production or export infrastructure (as with the Kharg Island strikes in February 2026), actual barrels are removed from supply. Strait/chokepoint risk adds a transport premium: if the Strait of Hormuz or Strait of Malacca is threatened, tanker insurance costs surge and some shipping lines suspend routes, raising costs for all oil regardless of its origin. Risk premium adds a speculative element: even without actual supply disruption, markets add a "geopolitical risk premium" that reflects uncertainty about future supply. Currency effects are a secondary channel: wars often cause the US dollar to strengthen (as a safe-haven currency), and since oil is priced in dollars, a stronger dollar means higher oil prices in local currencies like sterling.

The Crude-to-Pump Supply Chain

The journey from a barrel of crude oil to petrol in your tank involves multiple steps, each adding cost and time. Extraction: oil is produced from fields in the North Sea, Middle East, Russia, Americas, and Africa, with production costs ranging from $5/barrel in Saudi Arabia to $40/barrel in deepwater fields. Shipping: crude is transported by supertanker (VLCC) typically over 20–45 days, with freight costs adding $1–5/barrel. Refining: crude is processed into petrol, diesel, jet fuel, and other products, adding approximately $8–15/barrel in refinery margin. Distribution: refined product is transported by pipeline, road tanker, or ship from refineries to regional terminals and finally to individual forecourts. Retail: the forecourt adds its own margin. Throughout this chain, all participants hedge their exposure using futures markets, which is why pump prices often lead wholesale price movements by several days.

UK's Specific Oil Market Exposure

The UK has a dual relationship with oil markets. As a North Sea producer, it benefits from higher oil prices on its domestic production. As a net importer of refined petroleum products (the UK is a significant importer of diesel from European refineries), it is exposed to global price rises in everything its consumers use. The closure of Grangemouth refinery in 2025 reduced UK domestic refining capacity, increasing our dependence on imported refined products and therefore our vulnerability to disruptions in European supply chains.

The pound-dollar exchange rate is also a significant amplifier of oil market moves for UK drivers. If Brent rises 10% in dollar terms but the pound also strengthens 5% versus the dollar, the effective rise in sterling terms is only around 5%. Conversely, when geopolitical tensions cause both oil to rise and the pound to weaken (as often happens), UK drivers face a double hit.

Historical Oil Shocks & UK Prices

The 1973 OPEC oil embargo quadrupled the oil price and triggered the first major petrol crisis in the UK, with rationing and queues at stations. The 1979 Iranian Revolution caused a second price spike and contributed to the UK recession of 1980–81. The Gulf War of 1990–91 briefly spiked prices but was quickly resolved. The 2008 financial crisis drove Brent to $147/barrel — then the all-time high — before crashing to $32 during the recession. The 2022 Russia-Ukraine war drove European energy prices to record levels and UK petrol briefly hit 191.5p per litre in July 2022. The March 2026 Iran conflict represents the sixth major geopolitical oil shock in 50 years — and each one has been resolved eventually, with prices returning toward fundamental supply-demand equilibrium.

What This Means for UK Drivers

Understanding oil markets cannot prevent price rises, but it can help you respond more intelligently. When you see news of Middle East conflict, geopolitical risk, or OPEC production cuts, you can anticipate upward price pressure in the coming weeks and consider filling up promptly at a cheap local station rather than waiting. When ceasefire negotiations begin or OPEC signals production increases, that typically signals potential price relief. Use FuelFinderLive's price history feature to track your local stations' price patterns — some stations pass through wholesale reductions quickly while others lag by weeks.