What happened
Brent crude futures for November delivery rose 2.23 percent to 99.16 dollars a barrel on Wednesday, after touching an intraday high of 99.67 dollars in early Asian trading. Brent crude is the pricing benchmark used for roughly two thirds of the oil traded worldwide, which is why a move in Brent turns up quickly in fuel, freight and heating costs everywhere.
The jump followed another sharp turn in a conflict now in its seventh month. United States forces sank Iranian oil tankers, and the Iranian military answered with ballistic missile strikes on American bases in Jordan. Traders also reacted to reports of US strikes on targets near Kharg Island, the terminal that handles the overwhelming majority of Iranian crude exports.
The violence has spread well beyond the two combatants. Saudi Arabia confirmed that operations at certain energy facilities had been suspended after Houthi militants based in Yemen attacked them, wounding more than 70 people. Saudi Arabia is normally the producer markets rely on to fill gaps in supply, so damage to Saudi infrastructure removes the shock absorber at the same moment it adds to the shock.
The most consequential figure is not the oil price at all but the volume moving through the Strait of Hormuz, the narrow channel between Iran and Oman through which around a fifth of global oil normally passes. Transit has fallen from up to 9 million barrels a day in late August to under 2 million. Goldman Sachs has lifted its Brent forecast by 5 dollars to 85 dollars a barrel for December 2026 and to 80 dollars for 2027, and analysts have started modelling a move above 120 dollars if attacks on shipping intensify further.
Why it matters
Oil is an input into almost everything a modern economy produces. It moves goods, heats homes, powers factories, and feeds into fertiliser, plastics and food distribution. When crude rises sharply the cost shows up at the petrol pump within two to four weeks and in shop prices over the following six to nine months.
For central banks this is the most awkward kind of inflation, because it comes from the supply side rather than from overheating demand. Raising interest rates cannot produce more barrels, and it cannot reopen a shipping lane. What it can do is stop households and businesses from assuming that high inflation is permanent, which is the reason policymakers respond to energy shocks even though they cannot fix the cause.
Britain feels this doubly. Higher wholesale gas prices tied to the same conflict have already pushed the Ofgem price cap up 4 percent from 1 October, and the Bank of England has shifted to a more cautious stance because the balance of risks to inflation now tilts firmly upwards. That makes rate cuts less likely, not more, even as growth slows.
Company by company the effect splits neatly. Airlines, hauliers, chemicals producers and anything else that buys fuel in bulk face a margin squeeze. Oil majors such as Shell and BP gain. Because those two are among the largest members of the FTSE 100, the London market absorbs an oil shock rather better than continental European indices do.
Explained simply
Think of the Strait of Hormuz as the single doorway into a very crowded room. Nothing is on fire, but people have begun pushing near the exit, and the price of standing close to that door has gone up sharply.
The oil price does not only reflect the barrels being burned today. It reflects the market judgement about barrels arriving tomorrow, next month and next winter. That is why a headline about a missile can move the price more than a change in how much petrol drivers actually buy.
The contract quoted in the news is a futures contract, which is an agreement to buy a set quantity of oil on a set date at a price agreed now. When you read that Brent for November delivery is at 99 dollars, you are reading what buyers are willing to pay today to guarantee delivery in November. It is a price for certainty as much as for oil.
The collapse in Hormuz volumes matters because oil is not fungible in practice the way it is in theory. There is plenty of crude in the world, but it is in the wrong place, and the pipelines and tankers that would move it elsewhere take months to reroute. Cutting the doorway from 9 million barrels a day to under 2 million does not delete the oil. It delays it, and delay is what the price is really measuring.
This also explains why forecasters such as Goldman Sachs publish a December number well below the current spot price. They expect the disruption to ease, supply to reroute and demand to soften. The gap between 99 dollars now and 85 dollars in December is the market paying a premium for risk that most analysts expect to fade.
What it means for you
Petrol is the fastest transmission line. A useful rule of thumb is that a sustained 10 dollar move in Brent works through to roughly 6 to 7 pence a litre at UK pumps once refining margins and fixed fuel duty are accounted for, arriving over two to four weeks. If Brent holds near 100 dollars rather than retreating, expect forecourt prices to grind higher through late September and October.
Heating is the slower and larger hit. The Ofgem cap for a typical dual fuel household rises to 1,723 pounds a year from 1 October, driven mainly by an 8 percent increase in gas costs. If you are one of the roughly 22 million households on a default tariff, it is worth pulling up a comparison site this week. Fixed tariffs priced before the latest escalation may still be available, and a fix that looks slightly expensive against the current cap can look cheap against the January one.
Air fares are the delayed effect. Fuel is typically a fifth to a third of airline operating costs, and most carriers hedge months ahead, so today oil price shows up in next summer fares rather than in half term bookings. If you are planning a summer 2027 trip, booking earlier than usual has more logic than normal.
For investments, the shape of what you own matters more than the direction of oil. A FTSE 100 tracker carries a large energy weighting through Shell and BP, so it holds a partial hedge against exactly this scenario. A global tracker dominated by US technology holds almost none. Neither is a reason to trade, but it is a reason to understand why two funds behave very differently on a day like today.
The bigger picture
Energy shocks have a long and consistent history. The 1973 and 1979 oil crises both produced recessions and a decade of elevated inflation. The 2022 invasion of Ukraine pushed Brent above 120 dollars, yet within roughly a year prices had fallen back as demand adjusted, supply rerouted and buyers found new sellers. Markets are extremely good at rerouting, given time.
The difference this time is the chokepoint. Ukraine disrupted a producer. This conflict is disrupting a passage, and there is no straightforward alternative route for the crude that normally passes through it. That is why forecasters are willing to talk about 120 dollars while simultaneously forecasting 85 dollars by December: the outcome depends almost entirely on whether shipping through the strait resumes.
Three things are worth watching. First, daily transit volumes through Hormuz, which are the cleanest single indicator of how bad this actually is. Second, whether the halted Saudi facilities restart, since that determines how much spare capacity exists. Third, any sign of diplomatic contact, which historically takes more risk premium out of the oil price in a week than production changes do in a quarter.
