All Available Season All Season Specials Apr, 1975 0 episodes 0.0 Series 1 Apr, 1973 10 episodes 7.4 Series 2 Jan, 1974 8 episodes 7.0 Series 3 May, 1974 6 episodes 8.0 Series 4 Jan, 1975 6 episodes 7.3 Series 5 Apr, 1975 7 episodes 0.0 Series 6 Apr, 1976 7 episodes 0.0
