Cheaper oil today — your mortgage hasn't heard

The Iran deal that reopened the Strait of Hormuz did its fastest work in the markets — but London's response carried a very British twist. Global shares rallied and oil fell to around $84 a barrel, a three-month low, down from about $87 late last week and far below the $120 it touched during the conflict. Yet the FTSE 100 rose less than 1 per cent and lagged the wider relief. The reason is the index itself: it is heavy with oil majors, and when BP and Shell fall on cheaper crude they drag the whole blue-chip index down with them. The same news that helps a household can hurt the index that household's pension often tracks.

Hold that paradox, because it is the shape of the whole story: cheaper energy is good news for what you spend and awkward news for part of what you have saved. Start, though, with what does not change this week. The Bank of England's rate-setters meet on Thursday, 18 June, and are still expected to hold the base rate at 3.75 per cent. One good day in the oil market is not the stretch of low, steady inflation a central bank needs before it cuts. Inflation was already above target, pushed there by the conflict, and a single fall in crude does not undo months of higher energy costs already in the system. The Bank will want to see the ceasefire hold — it is a 60-day understanding, not a settlement — before it shifts its read.

At home, the relief is real but lagged, and that gap is where false hope lives. Cheaper crude today feeds into wholesale fuel over weeks and into pump prices after that; the 23.9p a litre petrol has added since February eases slowly, not overnight. The Ofgem energy cap still rises about 13 per cent in July, because it was set on the costs of a quarter already behind us — a June deal cannot rewrite it. And the swap rates that price fixed mortgages, which had been climbing on the expectation of higher-for-longer rates, may ease if markets now believe the inflation scare has peaked. But "may ease" is not "have eased," and fixed pricing moves on the trend, not on one morning's headline.

The honest summary is that today improved the weather, not the season. If a remortgage was already on your list, nothing about today argues for rushing or for waiting; it argues for getting current quotes, because the picture is moving in both directions at once and only a live quote tells you where you stand. The same logic holds for an energy fix before July's cap rise — the question is process, compare then decide, not a bet on where prices go next.

For three months the economy's risk came from a war pushing prices up. Now it comes from whether a fragile pause holds long enough for the falls to reach the things you actually pay for. That is a better problem to have. It is not the same as solved.