Five people have been found guilty for their roles in bank corruption and fraud costing hundreds of millions of pounds. A sixth, it can now be revealed, had already pleaded guilty. Lynden Scourfield, a middle-ranking banker with Halifax Bank of Scotland, accepted bribes in cash, foreign holidays and sexual entertainment. In exchange he would require small business customers to hire a firm of consultants called Quayside Corporate Services. The consultants claimed to be able to turn the business customers' fortunes around - but the truth was very different. File on 4 follows the story of two small Hbos clients, former rock and rollers, who fought for a decade to expose the fraud, even as the bank sought to repossess their home. We ask how this could happen, and how to prevent the ongoing mistreatment of small business customers by the banks. Reporter: Andy Verity Producer: David Lewis Editor: Gail Champion.