Season 1 BBC One , 1965 - 1966 Watch now Season 2 BBC One , 1966 - 1967 Season 3 BBC One , 1967 - 1968 Season 4 BBC One , 1968 - 1969 Season 5 BBC One , 1969 - 1970 Season 6 BBC One , 1970 - 1971 Season 7 BBC One , 1971 - 1972 Season 8 BBC One , 1972 - 1973 Season 9 BBC One , 1973 - 1974 Season 10 BBC One , 1974 - 1975 Season 11 BBC One , 1975 - 1976 Season 12 BBC One , 1976 - 1977 Season 13 BBC One , 1977 - 1978 Season 14 BBC One , 1978 - 1979 Season 15 BBC One , 1982 Season 16 BBC One , 1983