What happened
Brent crude, the global benchmark for oil prices, jumped back above 90 dollars a barrel, closing at 90.74 dollars after a gain of nearly 8 percent in a single session. The trigger was President Trump declaring that the memorandum of understanding between the United States and Iran was over, alongside a renewed wave of US strikes and a threat to blockade the Strait of Hormuz.
The moves capped a turbulent month. After the two countries signed a peace deal in June, oil had slid below 70 dollars a barrel on 1 July as traders bet the conflict was ending. That optimism reversed sharply, and prices climbed roughly 20 percent over the month as fighting escalated again.
The Strait of Hormuz is central to the fear. It is the narrow sea passage through which a large share of the worlds oil is shipped, so any threat to close it sends prices spiking.
Why it matters
Oil is the raw material behind an enormous slice of the economy. It fuels cars, lorries, ships and planes, heats homes, and feeds into the cost of making and moving almost everything. When oil jumps, those costs spread through the system.
That makes this a direct threat to the recent progress on inflation. Central banks including the Bank of England have been counting on calmer energy prices to help bring inflation down. A sustained spike in oil could undo some of that, keeping interest rates higher for longer.
The geography is what makes markets so jumpy. Because so much oil passes through the Strait of Hormuz, even the threat of disruption there can move prices sharply, before a single barrel is actually blocked.
Explained simply
Think of the Strait of Hormuz as a single narrow doorway that much of the worlds oil has to squeeze through. Rattle the door and everyone in the room panics, even if it never actually slams shut.
Oil prices are driven by supply and demand, but also by fear about the future. Traders are constantly trying to guess whether oil will keep flowing freely tomorrow. When a conflict threatens a key shipping route, they worry supply could shrink, so they rush to buy now, pushing prices up.
That is why prices can leap on words alone. A threat to close the strait does not have to happen to move the market; the mere risk is enough to make oil more expensive today, because buyers scramble to secure supplies before any disruption hits.
When the threat fades, as it briefly did after the June peace deal, the fear premium drains away and prices fall back. This month, the fear came flooding back in.
What it means for you
The most immediate hit lands at the petrol pump. Higher crude prices typically feed through to forecourt prices within a couple of weeks, so drivers could see the cost of filling up creep upward if oil stays around 90 dollars. A sustained 20 percent rise in crude can add several pence per litre over time.
It also threatens energy bills. Oil and gas prices tend to move together, and pricier energy raises the cost of heating and electricity, which flows into the regulated price cap and household budgets down the line.
More broadly, if oil-driven inflation forces the Bank of England to keep rates at 3.75 percent for longer, that delays cheaper mortgages and keeps borrowing costs elevated. So even if you do not drive, a lasting oil spike can reach your finances through the back door of interest rates.
The bigger picture
Oil has swung violently in 2026 as the US Iran conflict has flared, calmed and reignited. Each twist has whipped prices between the high 60s and the low 90s, a reminder of how sensitive energy markets are to geopolitics.
What to watch next is whether the strait stays open and whether the conflict cools once more. If tensions ease, the fear premium could unwind quickly and prices fall back, easing the pressure on inflation. If fighting drags on, expect volatile energy costs and a tougher job for central banks trying to tame prices.
