Former HSBC private banking boss said he was unaware of tax evasion . Chief executive Stuart Gulliver and private banks also angered him . chief executive chairman was either ' incompetent ' or aware of corruption .
Former HSBC private banking boss said he was unaware of tax evasion . Chief executive Stuart Gulliver and Rona Fairhead also angered MPs . BBC Trust chairman was either 'incompetent ' or aware of wrongdoing .