Jones is primarily known for his roles on British television, with his most prominent role being that of David Kano in the cult science fiction series Space: 1999 during its first season (1975-76). The series also starred Nick Tate as Alan Carter. In addition to his many television credits, Jones had small roles in such British films as The V.I.P.s (1963), Only When I Larf (1968), Decline and Fall... of a Birdwatcher (1968), Joanna (1968), and Innocent Bystanders (1972). He also voiced the role of Blackavar in the 1978 animated film adaptation of Richard Adams' novel, Watership Down.