none 

Statements about this table:
on 25 july 2006 for region 1 , there be 12 epiodes and region 2 have a date of 18 august 2008
on 25 july 2006 for region 1 , there be 12 epiodes and region 2 have a date of 18 august 2008
the dvd title series 6 have more than 12 episode in both region 1 and region 2
dvd title
no of discs
year
no of episodes
region 1
region 2
region 4
series 1
4
1978
13
14 may 2002
n / a
2 january 2013
series 1 , volume 1
3
1978
6
n / a
7 april 2003
1 september 2003
series 1 , volume 2
3
1978
7
n / a
5 may 2003
1 september 2003
series 1 & 2
8
1978
27
n / a
n / a
5 october 2010
series 2
4
1978
14
15 october 2002
n / a
2 january 2013
dvd title
no of discs
year
no of episodes
region 1
region 2
region 4
series 2 , volume 1
3
1978
7
n / a
7 july 2003
5 may 2005
series 2 , volume 2
3
1978
7
n / a
15 september 2003
5 may 2005
series 3
4
1979 - 1980
14
16 september 2003
23 october 2006
4 may 2006
series 4
3
1988
10
14 september 2004
26 december 2006
11 april 2007
series 5
4
1988
12
19 july 2005
3 march 2008
2 april 2008
dvd title
no of discs
year
no of episodes
region 1
region 2
region 4
series 6
4
1989
12
25 july 2006
18 august 2008
2 april 2009
series 7
4
1990
13
14 august 2007
26 december 2008
18 may 2010
christmas specials
2
1983 and 1985
2
16 september 2003
20 october 2008
2 april 2008
complete collection
33
1978 - 1990
90
15 january 2008
9 november 2009
n / a