Originally broadcast in 1973, the third series of Special Branch features an exceptional cast including George Sewell (Tinker, Tailor, Soldier, Spy), Patrick Mower (Callan), and Richard Leech (Doctor Who). Undergoing changes in style and cast from the previous series, the 1973 series would be the first production by Thames Euston Films division - later to produce The Sweeney, for which this landmark series is considered the blueprint.Spies, assassins, surveillance, and sudden death are business as usual for the Special Branch ofLondons Metropolitan Police. A classic British drama from the 1970s, this gritty police procedural focuses on the veteran cops and brash newcomers dedicated to stopping terrorism and countering espionage in the nations capital.