Christa Ackroyd used to be part of the fixtures and fittings at BBC Look North in Leeds. Sitting next to Harry Gration on the Look North sofa, she must have interviewed thousands of guests - me included. Suddenly, five years ago she was abruptly ousted from her place on the sofa, never to return again. 

She was accused of being a tax dodger because she was not employed by the BBC. She was instead paid through her own personal service company (PSC). Yes, her tax liability was lowered by not being employed, but the BBC also benefited because it didn't have to pay employer's national insurance contributions, holiday pay and sick pay.