(From Wikipedia) "Mortimer and Arabel was a puppet show based on Joan Aiken books which ran on CBBC from 1993 to 1994 and was later repeated from May to June 1994 on BBC One and BBC Two and June to December 1995..."
Apparently there were two seasons containing various adaptations of this British kids' show ( according to Toonhound: www.toonhound.com/mortimer.htm), but I've only managed to find one being sold on Amazon:
There's also a Spanish dub of some of the show on YouTube, in 17 parts (https://www.youtube.com/watch?v=Mzboo0CMmd0 ), but I can't find an English version online.
Not really sure if this is the right place to be posting this, but if anyone can help with information it would be much appreciated!