Season 1 BBC One , 1973 Watch now Season 2 BBC One , 1975 Watch now Season 3 BBC One , 1976 Watch now Season 4 BBC One , 1977 - 1978 Watch now Season 5 BBC One , 1979 - 1981 Watch now Season 6 BBC One , 1982 Watch now Season 7 BBC One , 1983 - 1984 Watch now Season 8 BBC One , 1985 - 1986 Watch now Season 9 BBC One , 1986 - 1987 Watch now Season 10 BBC One , 1988 Watch now Season 11 BBC One , 1989 Watch now Season 12 BBC One , 1990 Watch now Season 13 BBC One , 1991 Watch now Season 14 BBC One , 1992 Watch now Season 15 BBC One , 1993 - 1995 Watch now Season 16 BBC One , 1995 Watch now Season 17 BBC One , 1995 - 1996 Watch now Season 18 BBC One , 1997 Watch now Season 19 BBC One , 1998 Season 20 BBC One , 1999 - 2000 Season 21 BBC One , 2000 Season 22 BBC One , 2001 Season 23 BBC One , 2002 Season 24 BBC One , 2002 - 2003 Season 25 BBC One , 2004 Season 26 BBC One , 2005 Season 27 BBC One , 2006 Season 28 BBC One , 2007 Season 29 BBC One , 2008 Season 30 BBC One , 2008 - 2009 Season 31 BBC One , 2010
, 1973
