SCOTTISH businesses are under increasing pressure to raise their amount of working capital – the day-to-day costs of running a business – through sustained economic growth and the fall in the value of sterling.

They now have £35.6 billion tied up in excess working capital, according to Bank of Scotland, and it could expose them to greater risks should financial conditions deteriorate. The figure is up 13 per cent from the bank’s last report in May. The bank said sustained growth over the past 12 months, particularly in the manufacturing and services sectors, had increased the amount of cash tied up in the daily running of firms, with the effects of the fall in sterling, forward purchasing of inventory and a rise in input costs being fully realised.

Simon Quin, of Bank of Scotland global transaction banking, said: “The increase in the working capital index in Scotland over the past six months is the highest of anywhere in the UK.

“Significantly, at 105.2, it now suggests Scottish businesses are now under pressure to increase working capital, whereas in April, the pressure was to decrease it.

“This is probably a result of the fact that GDP in Scotland has seen a bit of a resurgence during that time, outstripping the rest of Britain earlier this year, and aided by the small recovery in the price of Brent Crude.

“But by locking up cash in this way, it stops investment in other more productive areas of the business, whether that be investing in new people, creating new products or targeting new markets.

“With as many as one in three businesses nationwide telling us that their greatest concerns for the next 12 months are economic uncertainty or a fall in sales, this reliance on future growth prospects is concerning.

“Ultimately, every pound tied up in working capital is a pound that could be invested in other, more productive areas of a business and this is something that businesses in Scotland should be managing closely.”

The findings are included in the bank’s second Working Capital Index, a six-monthly report that uses Lloyds Bank Regional Purchasing Managers’ Index (PMI) data to calculate the pressure British businesses are under to either increase or decrease working capital.

Growing businesses tend to use more working capital, while companies focus on releasing cash from it when they are facing challenges.

An index reading of more than 100 indicates pressure to devote more cash to working capital, while a reading of less than 100 indicates pressure to prioritise liquidity.

Scotland’s current reading 105.2 - an increase of more than five points from 99.5 in April.

Quin added: “Whether businesses expect to grow through exporting, or they anticipate challenges due to weakening domestic demand, firms in Scotland could benefit from the operational efficiency and cash flow boost that comes from working capital improvements.”