A CAR auction house has secured a £250,000 finance deal that helps keep business with its largest customer flowing.

Intercity Motor Auctions (IMA) received backing from Royal Bank of Scotland for a letter of credit in favour of Arnold Clark.

A letter of credit allows a supplier to have a greater level of confidence in dealing with a customer.

It typically means the bank or financial backer will cover any payments due to the supplier that are not received on time or for the correct amount.

The finance package means Glasgow-based IMA has secured its crucial relationship with the motor dealer.

Alan Mitchell, accountant at IMA, said: "It is something Arnold Clark is going to do with a number of auctioneers.

"We have a long-standing relationship there, so we were one of the first asked to get involved with this. It was very much an agreement forged between us and them.

"As an auction we never have title of the stock so it just secures Arnold Clark's stock position until such times as we settle the funds. For us it was crucial to do this. In the motor trade in Scotland if you are not dealing with Arnold Clark then you are not likely to be doing much."

IMA, founded in 1983, is Scotland's second-largest independent car auction company and employs 35 people. It had a turnover of £1.5 million in 2011.

Mr Mitchell praised the speed with which RBS put together the funding.

He said: "There is a competitive advantage in this for us. As Arnold Clark looks to roll this out, not all auctions will provide it. So for us it was really important it happened quickly and the bank, to their credit, got that immediately.

"We were adversely affected by the scrappage scheme as it diverted a lot of stock away from us and into the scrapyard.

"But we have ridden things out reasonably well and are still profitable."

Director and founder John Melvin added: "We've spent almost 30 years building this business and even though there have been some difficult economic periods, our business model allows us to thrive in good and tough times.

"There is great demand for the services we offer and we'll continue to maximise the opportunities we have." Andrew Scott, from RBS commercial banking in Glasgow, said: "This is a well-established business and our support reflects the vision, professionalism and commitment of the management team."

Arnold Clark declined to comment.