Season 1 ITV1 , 1973 Season 2 ITV1 , 1974 Season 3 ITV1 , 1974 - 1975 Season 4 ITV1 , 1975 - 1976 Season 5 ITV1 , 1976 - 1977 Season 6 ITV1 , 1977 - 1978 Season 7 ITV1 , 1986 Season 8 ITV1 , 1987 Season 9 ITV1 , 1988
, 1973