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What can happen when you highlight perceived wrongdoing at a business? Nicholas Wilson spent the past 13 years saying that a bank he worked for, HFC, had been overcharging people on their credit cards. Earlier this year his campaign paid off - thousands of people were offered a multi-million-pound compensation payout by HFC's new owners, HSBC. But the campaign has come at a great cost to the whistleblower Nicholas Wilson, as he told the Â鶹Éç's Rob Young. (Image: A stressed female worker with her head in her hands. Credit: Frederick Florin/ AFP/ Getty Images)