Season 1 ITV1 , 1969 - 1970 Watch now Season 2 ITV1 , 1970 - 1971 Season 3 ITV1 , 1971 - 1972 Season 4 ITV1 , 1972 - 1973 Season 5 ITV1 , 1973 - 1974 Season 6 ITV1 , 1975 Season 7 ITV1 , 1975 - 1976 Season 8 ITV1 , 1977 Season 9 ITV1 , 1977 - 1978 Season 10 ITV1 , 1978 - 1979 Season 11 ITV1 , 1980 Season 12 ITV1 , 1981 Season 13 ITV1 , 1982 Season 14 ITV1 , 1983 Season 15 ITV1 , 1984 Season 16 ITV1 , 1985 Season 17 ITV1 , 1986 Season 18 ITV1 , 1988 Season 19 ITV1 , 1989