Rachel Reeves touched down in Washington on Tuesday carrying an unacceptable burden: the International Monetary Fund’s decision that Britain is the biggest economic disaster in the Iran war among the world’s richest countries.
The Fund’s spring forecast, presented as the Chancellor arrives at the IMF and World Bank meetings, cut 0.5 percentage points from the UK’s 2026 growth forecast, the steepest figure given to any G7 economy since its January outlook. Inflation is now expected to exceed 4 percent, while unemployment is headed for its highest level in more than a decade.
For small and medium-sized businesses, which account for two-thirds of the UK’s private sector workforce, the numbers translate into a grim set of pressures: soft consumer demand, stubborn inflation and a Treasury with precious little room to cushion the blow.
The UK has already entered the fray on foot. Growth weakened before the first rockets flew, with firms and households scrambling ahead of last year’s Budget amid a haze of tax speculation that dampened activity on the high street and in the boardroom alike.
Pierre-Olivier Gourinchas, the IMF’s economic adviser, pointed to what he called a “shadow effect” that continues in that weak momentum, a drag the Fund believes will spill over into next year’s performance. It is a diagnosis that the Chancellor strongly rejects, saying that Labor inherited a corrupt economy from the Conservatives and has since laid a strong foundation. Yet the data is unsympathetic: British households were already grappling with the highest inflation rates of the G7 before one Iranian oil field was hit.
The deeper problem is power. The Iran conflict has delivered the biggest shock to global assets since the oil crises of the 1970s, while Britain’s heavy-handed energy mix leaves it unusually exposed. Although most of the country’s gas is produced locally, loads from other countries are bought at very high wholesale prices, and because gas undercuts UK electricity, the pain travels quickly from terminal to meter.
“There is a lot of pass-through, if you will, of fuel prices to total electricity prices,” Gourinchas noted, noting that household debt was temporarily reduced by existing government measures.
Reeves used his Washington platform to push for de-escalation while sharpening his criticism of Donald Trump’s decision to prosecute the war on Iran. The political figures are obvious enough. With public finances under pressure from high debt and compulsively high borrowing costs, his fiscal position is wafer-thin, and Labor is trailing in the polls as May’s local elections approach.
Treasury insiders expect short-term, narrowly targeted aid measures instead of massive spending, which is the IMF’s own mandate. Any expansion risks derailing a rosy market and undoing the hard-earned credibility Reeves has spent the past year trying to bank on.
For the British business community, the most important question is what happens when the crisis is over. Protecting the country from the next energy shock will require a greater push for domestic renewable generation, grid strengthening and the kind of supply-side reforms that open up large-scale private investment.
SME owners hoping for relief will be watching two pressure points closely: whether the promised targeted support reaches small firms exposed to rising input costs, and whether the long-promised industrial strategy finally delivers the cheap, home-grown energy Britain’s manufacturers have been seeking for the better part of a decade.
Reeves returns from Washington with the blessing of the IMF for his financial blockade, but also with an unequivocal warning that, in the current situation, Britain will spend 2026 at the bottom of the G7 table. For the Chancellor who is already short of political capital, that is a decision he cannot let go of.
