Because everyone needs animated films involving severed heads

I just discovered, in a comment thread at boingboing (which follows a hilarious post, by the way), that a Welsh TV channel has made an animated film of the Mabinogion. Y Mabinogi, or The Otherworld, apparently exists in both English and Welsh, and includes Ioan Gruffudd as the voice of Bendigeidfran (although I don't know whether he's cast in both the English and Welsh versions).

I must see this film, if only because the movie website has a shot of Bendigeidfran's head on a stretcher. Alas, it appears that there are no DVDs being sold. I checked iTunes and found a great bilingual retelling of the making of Blodeuwedd, but no animated Four Branches. Youtube searches for "Y Mabinogi" or "Otherworld" bring up video game clips and scenes from unrelated anime. Can any of you help me find the movie? (I'd prefer either the English version or, even better, Welsh with subtitles!)