dvd title  no of discs           year  no of episodes           region 1           region 2          region 4
0              series 1            4           1978              13        14 may 2002              n / a    2 january 2013
1   series 1 , volume 1            3           1978               6              n / a       7 april 2003  1 september 2003
2   series 1 , volume 2            3           1978               7              n / a         5 may 2003  1 september 2003
3          series 1 & 2            8           1978              27              n / a              n / a    5 october 2010
4              series 2            4           1978              14    15 october 2002              n / a    2 january 2013
5   series 2 , volume 1            3           1978               7              n / a        7 july 2003        5 may 2005
6   series 2 , volume 2            3           1978               7              n / a  15 september 2003        5 may 2005
7              series 3            4    1979 - 1980              14  16 september 2003    23 october 2006        4 may 2006
8              series 4            3           1988              10  14 september 2004   26 december 2006     11 april 2007
9              series 5            4           1988              12       19 july 2005       3 march 2008      2 april 2008
10             series 6            4           1989              12       25 july 2006     18 august 2008      2 april 2009
11             series 7            4           1990              13     14 august 2007   26 december 2008       18 may 2010
12   christmas specials            2  1983 and 1985               2  16 september 2003    20 october 2008      2 april 2008
13  complete collection           33    1978 - 1990              90    15 january 2008    9 november 2009             n / a

Table as JSON:
{"dvd title":{"0":"series 1","1":"series 1 , volume 1","2":"series 1 , volume 2","3":"series 1 & 2","4":"series 2","5":"series 2 , volume 1","6":"series 2 , volume 2","7":"series 3","8":"series 4","9":"series 5","10":"series 6","11":"series 7","12":"christmas specials","13":"complete collection"},"no of discs":{"0":4,"1":3,"2":3,"3":8,"4":4,"5":3,"6":3,"7":4,"8":3,"9":4,"10":4,"11":4,"12":2,"13":33},"year":{"0":"1978","1":"1978","2":"1978","3":"1978","4":"1978","5":"1978","6":"1978","7":"1979 - 1980","8":"1988","9":"1988","10":"1989","11":"1990","12":"1983 and 1985","13":"1978 - 1990"},"no of episodes":{"0":13,"1":6,"2":7,"3":27,"4":14,"5":7,"6":7,"7":14,"8":10,"9":12,"10":12,"11":13,"12":2,"13":90},"region 1":{"0":"14 may 2002","1":"n \/ a","2":"n \/ a","3":"n \/ a","4":"15 october 2002","5":"n \/ a","6":"n \/ a","7":"16 september 2003","8":"14 september 2004","9":"19 july 2005","10":"25 july 2006","11":"14 august 2007","12":"16 september 2003","13":"15 january 2008"},"region 2":{"0":"n \/ a","1":"7 april 2003","2":"5 may 2003","3":"n \/ a","4":"n \/ a","5":"7 july 2003","6":"15 september 2003","7":"23 october 2006","8":"26 december 2006","9":"3 march 2008","10":"18 august 2008","11":"26 december 2008","12":"20 october 2008","13":"9 november 2009"},"region 4":{"0":"2 january 2013","1":"1 september 2003","2":"1 september 2003","3":"5 october 2010","4":"2 january 2013","5":"5 may 2005","6":"5 may 2005","7":"4 may 2006","8":"11 april 2007","9":"2 april 2008","10":"2 april 2009","11":"18 may 2010","12":"2 april 2008","13":"n \/ a"}}