14/11/2011 Channel 4, 9pm Confessions of an Undercover Cop

Might sound a bit sensationalist, but from the Cutting Edge stable, which is reason enough to watch it.
The Blurb : "Documentary following undercover police officer Mark Kennedy, who spent eight years as a dedicated activist, having infiltrated the environmental movement and Europe's left-wing extremist political groups. Now, with his cover blown, Kennedy has lost his wife and children, and the friends he made during his time with the protesters have labelled him a traitor. In this Cutting Edge film, he discusses the consequences of his actions, as police bosses claim he has forgotten who he really is"