Divided They Fall: Far-right political party The British Way is threatening democracy so Adam and Fiona go undercover to infiltrate and destroy its campaign.
Regular Cast: Peter Firth (Harry Pearce), Rupert Penry-Jones (Adam Carter), Nicola Walker (Ruth Evershed), Anna Chancellor (Juliet Shaw), Raza Jaffrey (Zafar Younis), Hugh Simon (Malcolm Wynn-Jones)
Guest Cast: Rory Macgregor (Colin Wells), Olga Sosnovska (Fiona Carter), Rupert Graves, David Threlfall, Steven Pacey, Margot Leicester, Mark Flitton, James Dicker, Joanna Burnett
Writer: Ben Richards / Director: Alrick Riley
Airdate: 22 Sep 2005 on BBC One
Series: Spooks Season 4 Episode 3
Show Info: The cases of a group of MI5 officers based at the service’s Thames House headquarters, in a highly secure suite of offices known as The Grid.