British families are paying 30% more at the pump because of the Iran war, and the inflation that follows is coming for American wallets next.

UK inflation hit 3.5% in September — the highest in almost a year and well above the Bank of England's 2% target — driven almost entirely by surging motor fuel costs tied to the U.S.-Israel war on Iran and the resulting squeeze on oil moving through the Strait of Hormuz. It's the latest proof that foreign interventions don't stay foreign: they come home in the price of gas, groceries, and borrowing costs.

The Office for National Statistics reported Wednesday that consumer prices rose 3.5% in the year to September, up from 3.1% in August and above the 3.4% economists had expected. Motor fuel prices surged roughly 30% over the same period — the highest fuel inflation rate since August 2022, when Russia's invasion of Ukraine sent pump prices skyward.

The cause isn't a mystery. U.S. News & World Report notes that "fuel costs have been soaring because of the Iran war and the ensuing bottlenecks in the Strait of Hormuz." That outlet frames the conflict as simply "the Iran war." Europe Says is more direct, calling it "the U.S.-Iran war" and noting that Britain, as a net energy importer, is especially vulnerable to the shock. U.S. News, for its part, quietly buries the origin story in a single sentence at the bottom of its report: "Interest rates in the U.K. had been trending downward from a 15-year high of 5.25% until the U.S. and Israel attacked Iran in late February."

That's the whole story in one line. The U.S. and Israel attacked Iran. Working people in Britain — and soon in America — are paying for it at the pump.

The fallout is compounding. Suren Thiru, chief economist at the Institute of Chartered Accountants in England and Wales, said rising inflation is turning the government's upcoming budget into "a perilous high-wire act" for the chancellor, "increasing pressure for cost-of-living support while pushing up government borrowing costs." He added: "With inflation increasing, the pieces are falling firmly in place for a November rate rise."

Markets are pricing in a 98% chance the Bank of England hikes its key rate by 25 basis points to 4% next month, with traders also betting on another hike of the same size in December, according to LSEG data cited by Europe Says. Scott Gardner, investment strategist at J.P. Morgan Personal Investing, warned that "services inflation, in particular, has accelerated in recent months which will create concern that we are starting to see second round inflationary effects beyond energy prices." Translation: the war shock is spreading through the whole economy.

Meanwhile, UK national debt surpassed £3 trillion for the first time in September, and the cost of servicing that debt is climbing. Chancellor of the Exchequer John Healey promised to deliver "some breathing space" for families while "maintaining our fiscal discipline" — the kind of empty assurance politicians deliver when the math doesn't work.

The Federal Reserve and the European Central Bank have already raised rates. The same war-driven price pressure now hammering British households will reach American gas stations and grocery aisles. The only question is whether anyone in Washington will name the cause — a war of choice that the American people never voted for — before the bill arrives.