His TV audience is in the millions. His new game show launches soon on ITV. He has over 8 million followers on Twitter. And he wasn’t too bad at football either. So how did Gary Lineker become a media powerhouse? From Des Lynham's presenting tips to the effect of TV rights deals on football, Lineker tracks his transition from superstar player to Saturday night TV host. But does he ever worry his social media posts could damage the BBC's reputation for impartiality?Studio engineer: Sue MaillotProducer: Hannah SanderPresenter: Ros Atkins