LONDON, May 7 (Reuters) – British builders saw one of the biggest month-on-month jumps in cost inflation on record in April, according to a survey on Thursday that also showed the Iran war increased ​delivery delays and other supply chain difficulties.

The S&P Global UK Construction Purchasing Managers’ ‌Index’s measure of input cost inflation leapt to 81.4, its highest since June 2022. The jump from 70.5 in March was the second-biggest rise since 1997 when the data series began, only just shy of the 11-point ​jump from February to March.

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The headline construction PMI, which measures overall activity, fell to ​39.7 from 45.6, its weakest since November and below all economists’ expectations ⁠in a Reuters poll.

S&P said around 69% of survey respondents reported a rise in their ​input costs in April, up from 48% in the month before.

“A rapid acceleration of input cost ​inflation was seen across the UK construction sector in April. Aside from the post-pandemic surge in input prices from early-2021 to mid-2022, the latest rise in purchasing costs was the steepest in three decades of data collection,” ​said Tim Moore, economics director at S&P Global Market Intelligence.

The Bank of England is closely ​monitoring measures of input prices and prices charged by companies as it tries to gauge whether the inflation ‌impact from ⁠the war will last long enough to require increases in borrowing costs.

Businesses reported the most widespread delays in shipping times since December 2022, S&P said, as vessels were largely unable to pass through the Strait of Hormuz.

The conflict in the Middle East also hit new orders, which ​declined at the sharpest ​rate since last November.

The ⁠pace of job-shedding also accelerated in April, with the employment index at its lowest since December, as firms cited less work and higher payroll ​costs.

Companies’ optimism about the coming 12 months dropped too.

The construction PMI ​showed civil engineering ⁠and residential house-building were the biggest drag on activity, while commercial building contracted less severely.

The wider all-sector PMI, which includes previously released services and manufacturing figures, rose to 51.5 from March’s 49.9, reflecting stronger services ⁠performance.A ​separate survey from the Royal Institution of Chartered Surveyors, published ​earlier on Thursday, showed construction activity in the three months to March was the weakest since the three months to June ​2020, when the COVID-19 pandemic partially closed building sites.

Reporting by Suban Abdulla; Editing by Joe Bavier

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