Brent crude and global equities lurched on Monday, the tenth day of the US–Israeli operation against Iran. Oil spiked toward $120 a barrel before falling back below $90 after President Donald Trump rang round US media outlets; US indices recovered as the tone shifted. For UK readers, the immediate story is volatility rather than trend, but the real‑world read‑through is plain: fuel, freight and investor sentiment are all in play.

Across interviews, the message changed by the hour. To the New York Post, Trump said, “I have a plan for everything,” and promised Americans would be “very happy.” On CBS News he described the war as “very complete, pretty much” and “very far ahead of schedule,” then acknowledged that any wrap‑up “depends.”

By evening he tempered talk of an imminent end, calling the operation a “tremendous success” while also vowing to “go further” if required. He labelled the campaign an “excursion” and warned of harder strikes if Iran continued to threaten tankers exiting the Gulf.

He also sketched a broader goal: preventing Iran from developing weapons that could target the US, Israel or allies “for a very long time.” Coupled with Tehran’s political shift after the late Ayatollah Ali Khamenei was succeeded by his son, the end‑state of the mission remains opaque for markets and policymakers alike.

Meanwhile, defence secretary Pete Hegseth told CBS a next phase would use larger conventional bombs on military targets, saying the air campaign had barely begun. Asked about the tension with his own “very complete” line, Trump replied, “I think you could say both,” before adding, “It’s the beginning of building a new country.”

For markets the nearer‑term pinch point is the Strait of Hormuz, where shipping has been close to a standstill, choking supply routes and lifting war‑risk premia. Even with the UK’s diversified energy mix, a block there tightens global barrels and freight, pushing up British wholesale costs.

For UK budgets, Brent-not WTI-is the reference price. Pump prices typically follow wholesale moves with a short lag because many retailers buy forward; if crude stabilises higher, motorists feel it within weeks, and diesel‑reliant firms are usually first in line.

On equities, the FTSE 100’s make‑up matters. Oil majors such as BP and Shell can buoy the index when crude jumps, even as airlines, supermarkets and logistics names wobble on higher input costs. The push‑and‑pull often leaves the tape choppy rather than one‑way on oil shocks.

SME owners are already running the numbers. Renegotiating fuel clauses with clients and couriers, planning temporary surcharges, and mapping alternative routings if Gulf sailings remain restricted can protect margins. Staggering modest hedges and stress‑testing cash flow for longer transit times add resilience without over‑committing.

In the US, the average gasoline price is about $3.48 a gallon, up 48 cents in a week, while February payrolls fell by 92,000, unemployment rose to 4.4% and participation slipped to 62%, according to the Bureau of Labor Statistics. That mix helps explain why “affordability” now dominates voter concerns alongside unease about the campaign itself.

Even in a safely conservative special election in north‑west Georgia, voters told reporters they fear fuel‑driven recession risks, retirees worry about monthly budgets, and a Democratic challenger argues the war could shift votes because “those voters have sons and daughters” deployed. Political risk is bleeding into market risk.

The White House insists higher prices are temporary. Investors will test that claim day by day. For UK households and finance teams the watch points are clear: the administration’s timeline, safe passage through Hormuz, insurers’ war‑risk stance, and whether Brent’s retreat below $90 can hold. If it doesn’t, pumps and P&Ls follow.