Stephen Sackur talks to the film and TV producer Tony Garnett . Watching TV is something pretty much all of us do for news, sport and entertainment, but how much of what we stare at on the box do we actually remember? His subjects of homelessness, illegal abortion, police corruption point to his radicalism - he uncovered dark corners of British life. How much of his motivation came from the dark corners in his own life?(Photo: Tony Garnett in the Hardtalk studio)