Figures compiled by the British Bankers Association show there was a big increase in the amount of business lending members took out of the economy in February compared with preceding months.
High Street banks cut lending by £300m net of repayments in January and by a monthly average of £500m in the six months to February.
The figures may spark renewed concern about whether banks are doing enough to support businesses as the UK recovers from a long economic downturn.
Howard Archer, UK economist at IHS Global Insight, said: "It is vital for healthy and more balanced UK growth that all companies who are in decent shape and who do want to borrow... can do so, and at a non-punishing interest rate."
Mr Archer said he hoped the Bank of England's decision to focus the Funding for Lending scheme on businesses and to end support for mortgage activity had a significant impact.
He noted the last survey of credit conditions by the Bank of England reported a "significant" increase in credit availability to corporates in the fourth quarter of 2013.
Businesses may want to borrow more to capitalise on the economic recovery.
The British Bankers Association said: "Borrowing demand from businesses is improving, with manufacturers, wholesale and retail sectors having expanded their borrowing from a year ago."