Double, Double: Part 1 Crown Court : Season 3 Episode 118

MI6 interpreter Kenneth Gould stands accused of passing secrets onto the KGB, in one instance resulting in the deaths of two British agents. The evidence of a Soviet defector is vital to the prosecution case but the defence argue that this man is in fact still working for the KGB and is an unreliable witness. The prosecution also assert that Gould, a man of working class origins, is a communist sympathiser but he insists he has no political allegiance and is the victim of dark forces in British intelligence.