Author James Bannon
Media playback is unsupported on your device

Going undercover with 'the firm'

Former undercover police officer James Bannon spent 2 years during the mid eighties trying to infiltrate one of football's most notorious gangs.

His story was turned into a movie, I.D, in 1995, but he remained anonymous.

That is until now, with the publication of his account of those years in Running With The Firm.

James told BBC Breakfast about his true story.