Spooks (series 1)
Kudos Film and Television developed "Spooks" after releasing Channel 4 medical drama "Psychos" in 1999, though the company initially faced friction from television networks which saw no potential in a post-Cold War spy show. The producers later successfully pitched the series to the BBC after the networks' commissioning teams were replaced. Four episodes were being written when the September 11 attacks took place, and the some scenes were rewritten to take the event into account to show the audience "Spooks's" goal of fighting terrorism. Throughout production, the producers were advised by former intelligence officers from the Security Service, KGB and Central Intelligence Agency. Filming took place from November 2001 to March 2002.
Spooks (series 10)
Two main characters from the ninth series did not return for the tenth. Richard Armitage did not return as Lucas North. Firth has stated that Lucas "was always going to die" at the end of the ninth series. At the time the series was produced, Armitage was filming for "The Hobbit" film project. Also, Sophia Myles did not return as Beth Bailey as the character was decommissioned between the ninth and tenth series. Myles left the series as she wanted to pursue other projects in America. Matthew Macfadyen, who starred in the first two series as protagonist Tom Quinn, returned for a cameo appearance in the series finale.