Season 1 BBC Two , 1978 - 1979 Season 2 BBC Two , 1979 - 1980 Season 3 BBC Two , 1980 - 1981 Season 4 BBC Two , 1981 Season 5 BBC Two , 1982 - 1983 Season 6 BBC Two , 1983 - 1984 Season 7 BBC Two , 1984 - 1985