What happened
Brent crude, the global oil benchmark, rose above 85 dollars a barrel this week, its highest in a month, after US forces carried out fresh airstrikes on Iranian missile sites near the Strait of Hormuz. It was the third straight session of gains.
The Strait of Hormuz is a narrow stretch of water between Iran and Oman through which roughly a fifth of the world seaborne oil passes. Any threat to shipping there sends traders scrambling, because even a partial disruption could choke global supply.
Tensions escalated further after reports that President Donald Trump is leaning toward broadening US military operations and has discussed the possible seizure of Kharg Island, Iran main oil export terminal. The US Treasury also said it would stop permitting sales of Iranian oil after 17 July.
The jump reversed a recent slide that had taken prices back toward pre-conflict levels, showing how quickly the oil market can swing on a single headline.
Why it matters
Oil is the one price that touches almost every other price. It powers the lorries that stock supermarket shelves, the planes people fly on and the factories that make everyday goods. When crude jumps, those extra costs eventually show up in shop prices, airfares and delivery charges.
Most immediately, the pump price of petrol and diesel tracks the oil price with a lag of a week or two. A sustained move above 85 dollars a barrel typically feeds through to a few extra pence per litre at the forecourt, which adds up quickly for anyone who drives to work.
Higher energy costs also complicate the job of central banks. Just as inflation was cooling, a spike in oil threatens to push it back up, which could keep interest rates, and therefore mortgage costs, higher for longer.
For the UK specifically, the timing is awkward. The economy has only just returned to firmer growth, and an energy shock is exactly the kind of thing that could stall the recovery.
Explained simply
Think of the Strait of Hormuz as the single doorway through which a fifth of the world oil has to squeeze. Rattle the door and everyone in the room panics, whether or not it actually slams shut.
Oil prices are set by the balance of supply and demand, but they are also driven heavily by fear. Traders do not just price in what is happening today, they price in what might happen tomorrow. So the mere risk that shipping through the Strait of Hormuz could be disrupted is enough to push prices up, even if not a single tanker is actually stopped.
That is why a military strike hundreds of miles away can add several dollars to the cost of a barrel almost instantly. The market is buying insurance against a worst-case outcome.
When the perceived threat fades, prices fall back just as fast, which is exactly what had happened in the days before this latest flare-up. The recent surge is that pattern in reverse: fear returning to the market.
The key point for households is that this volatility is not really about how much oil exists right now, but about how nervous traders are about the near future.
What it means for you
The clearest hit is at the petrol pump. If Brent stays above 85 dollars, expect forecourt prices to creep up by a few pence per litre over the next couple of weeks, adding a pound or two to a typical tank of fuel each fill-up.
Home energy bills are the next concern. Wholesale gas prices often move with oil, so a sustained rise feeds into the price cap that governs what millions of households pay for heating and electricity, though that effect takes longer to arrive.
For investors, higher oil is a mixed bag. If you hold a FTSE 100 tracker, you actually own big oil producers such as Shell and BP, whose shares tend to rise when crude does, which can cushion your portfolio. But airlines, and companies that use a lot of fuel, tend to suffer.
If you are budgeting for the months ahead, it is sensible to leave a little slack for higher transport and energy costs, and to lock in a fixed energy deal if a competitive one is available before any increases feed through.
The bigger picture
Oil shocks have a long history of tipping economies off course, from the 1970s crises to the price spike after Russia invaded Ukraine in 2022. Each time, the pattern is similar: energy costs jump, inflation follows, and central banks are forced to choose between fighting rising prices and protecting growth.
The current episode is being driven by geopolitics rather than a shortage of oil in the ground, which means prices could fall back quickly if tensions ease. But the risk of a genuine supply disruption through the Strait of Hormuz keeps a nervous premium in the price.
Watch for any sign of escalation or de-escalation around Iran oil exports, and keep an eye on how the Bank of England weighs this at its 30 July meeting. A sustained oil spike could tie its hands on cutting rates.
