The war in the Middle East has delivered the biggest leap in UK manufacturers’ costs since 1992, sending a fresh shock through an already fragile industrial sector and reviving the spectre of sustained cost-push inflation. The flash March reading of the Purchasing Managers Index PMI shows that factory input prices are rising at the fastest pace in more than three decades, outstripping any comparable jump seen in the post-pandemic, Brexit or Ukraine war episodes. While the broader private sector remains in expansionary territory, growth has slowed to its weakest pace in six months, with firms explicitly citing the Iran-centred conflict as a key driver of higher operating costs, weaker demand, and disrupted supply chains. For UK policymakers and manufacturers, the headline is clear: even as the Bank of England debates rate cuts, a new war-driven energy and logistics shock is landing directly on the cost structure of British industry, with potentially lasting consequences for inflation, competitiveness, and employment.
What the new data actually shows
The March PMI snapshot paints a picture of an economy caught between sluggish growth and surging input costs. The composite PMI for private sector activity edged above 50, indicating slight expansion, with manufacturing performing only marginally better than the broader economy. More striking is the price data: around 47 per cent of manufacturers reported higher input costs in March, compared with only 2 per cent citing lower costs, marking the largest single-month acceleration in input inflation since the turmoil of Black Wednesday in 1992. For energy-intensive industries such as chemicals, glass, metals and cement, this means that the share of energy in their overall cost base is suddenly becoming a decisive determinant of profitability, not just a background expense. At the same time, firms are passing much of this pressure on to consumers. The PMI shows that output prices are rising at the fastest pace since April 2025, driven by higher fuel, transport and raw material charges rather than strong domestic demand. This cost pass-through risks embedding a second-round effect into the economy, as households and other businesses face higher prices for manufactured goods at a time when real incomes are still recovering from the previous energy crisis cycle. The survey also notes that employment in the manufacturing sector has now fallen for an eighteenth consecutive month, a worrying trend that suggests firms are choosing to cut staff and capacity rather than absorb the latest cost wave, which could deepen the long-term damage to the UK’s industrial base if the war-driven shock persists.
Why the Iran war hits UK manufacturers so hard
The direct UK-Iran trade volume is small, but the war’s impact on UK manufacturing runs through three broader channels: global energy prices, transport and insurance costs, and the price of petrochemical and metal inputs. Oil remains the backbone of industrial energy supply, and Brent crude now trades close to 50 per cent above its pre-war level, while European gas prices have risen by more than 90 per cent within the month. Because the UK’s energy price cap protects households but not heavy industry, these spikes land directly on factory energy bills, eroding already thin margins in sectors where energy can account for 20 to 40 per cent of total production costs. Shipping lanes through the Gulf and the Suez region have also become riskier and more expensive, pushing up freight and insurance premiums for components, intermediate goods, and finished products that move via these routes. International advisers such as FRP warn that this combination of higher energy plus higher logistics costs has created a renewed wave of cost shock for UK manufacturers, arriving at a moment when many firms had only recently stabilised after the Ukraine war and pandemic-related disruptions. In practice, that means some producers are forced to raise prices, cut shifts, or delay investment, all of which feed into the PMI’s narrative of stalled growth and rising inflationary pressure, even as overall activity stubbornly clings above contraction.
Implications for the Bank of England and the UK economy
For the Bank of England, the March PMI data crystallise a difficult trade-off. On one side is the risk that a war-driven energy shock becomes entrenched as a structural driver of inflation, forcing the Monetary Policy Committee to maintain a tighter-than-expected monetary stance despite softening growth. On the other side is the danger that keeping rates too high for too long deepens the slowdown in manufacturing and services, especially in the face of an already weak labour and output outlook. If the war eventually ends and the Strait of Hormuz fully reopens, oil and gas prices may retreat from their current peaks, but analysts warn that damage to Gulf energy infrastructure and the re-pricing of geopolitical risk could keep energy costs materially above pre-war levels for years. For UK manufacturers, that implies a prolonged period of elevated input costs, where the ability to protect margins depends on productivity improvements, energy efficiency investments, and supply chain reshaping, all of which require capital and policy support. In political economic terms, the biggest leap in manufacturers’ costs since 1992 is therefore not just a one-off statistic; it is a signal that the UK economy has entered a new phase of war-driven cost shock in which the fault lines between industry, energy policy, and monetary stability will define the success or failure of the post-Iran crisis recovery.