The UK's services sector contracted sharply in May, recording its weakest performance since 2016 when pandemic-era figures are set aside. The downturn, captured by the S&P Global Purchasing Managers' Index, has alarmed economists who warn that the economy may be approaching a reversal after a period of relatively steady growth.

The services sector carries considerable weight in the British economy, accounting for roughly 80% of GDP. Its decline is not a peripheral concern. When hospitality, retail, finance and IT all move in the same direction at the same time, the consequences register quickly in employment figures, tax receipts and consumer confidence.

The PMI's composite output index, which tracks activity across both manufacturing and services and uses a threshold of 50 to separate growth from contraction, fell to 48.5 in May. In April it stood at 52.6. Economists polled ahead of the release had forecast a reading of 51.6. The gap between expectation and outcome was considerable. It was the lowest composite reading since April 2025.

Analysts at S&P Global Market Intelligence identified two causes. First, the conflict in the Middle East following Iran's involvement has disrupted supply chains, inflated operating costs and introduced a level of global instability that businesses have found difficult to plan around. Second, domestic political uncertainty under Prime Minister Keir Starmer has, according to firms surveyed, made investment and recruitment decisions harder to commit to. Chris Williamson, S&P Global's chief business economist, was direct: the war bears the primary responsibility, though domestic politics are adding to the pressure.

If May's numbers hold into subsequent months, the implications for GDP are significant. Andrew Wishart of Berenberg has noted that a sustained PMI reading at this level would point to a contraction of 0.2% in the second quarter, compared with the 0.6% expansion recorded in the first. That would mark a sharp reversal, not a gentle slowdown.

The labour market reflects similar pressure. Private sector payrolls have now fallen for twenty consecutive months. The most recent acceleration in job losses has been concentrated in services. Data from the Office for National Statistics published this week showed 100,000 fewer payrolled employees in April, following a 28,000 decline in March. The April figure was the sharpest monthly drop since 2014.

Manufacturing offered a partial counterpoint. Activity in the sector rose to a three-month high in May, though the reason was specific and unlikely to be sustained. Businesses were front-loading orders in anticipation of future price rises and potential supply disruptions linked to shipping delays in the Gulf. Separately, the Confederation of British Industry reported that manufacturers' order books were at their lowest since 2020 and that demand was expected to fall further over the next three months. The uptick in output was real; what drove it was caution rather than confidence.

The broader economic slowdown has, in one sense, reduced a particular kind of pressure on the Bank of England. With inflation falling to 2.8% in April from 3.3% in March, and wage growth cooling to 3.4%, there is less evidence of the kind of sustained price spiral that would compel policymakers to act. Paul Dales of Capital Economics noted that the PMI data was the third set of figures in three days to suggest the Bank does not need to raise rates from their current level of 3.75% at its June meeting.

The picture that emerges is of an economy sensitive to forces it cannot easily control. The duration and trajectory of the conflict in the Middle East will matter more than any domestic policy adjustment in the near term. Until there is greater clarity on both fronts, businesses appear to be doing what uncertain businesses do: waiting.

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