Appeared with Welsh actor Gareth Thomas in two science fiction programs in the 1970s: Star Maidens, in which he played Professor Evans and a guest appearance in the Blake's 7 episode "Orac" as Ensor, creator of Orac. He also provided the voice of Orac in that episode.
Formerly a schoolteacher before becoming a stage actor in 1937.
In 1955 he featured in the Capstan "Navy Cut" Cigarette advertisement under the slogan, "How Derek Farr Got Away from the Crowd".
Played a group captain in The Dambusters; his younger brother, Air Vice Marshall Peter Farr OBE DFC (1917 - 2009) was a bomber pilot during WW2.
Son of Gerald and Vera Eileen (Miers) Farr.