All Available Season All Season Specials Jan, 0001 3 episodes 0.0 Series 1 Apr, 1973 13 episodes 0.0 Series 2 Feb, 1974 13 episodes 0.0 Series 3 Feb, 1975 13 episodes 0.0 Series 4 Jan, 1976 7 episodes 0.0 Series 5 Feb, 1977 6 episodes 0.0 Series 6 May, 1978 6 episodes 0.0 Series 7 Oct, 1978 6 episodes 0.0 Series 8 Jan, 1979 4 episodes 0.0