I think this is the documentary that Bookchin was referring to. It looks like it was a Granada-MPI Home Video production. I'm not sure where the BBC came into this - unless it aired on BBC originally.

I can't tell where you are located, but it looks like the video is available is many libraries throughout the country. You can see local holdings here: http://www.worldcatlibraries.org/oclc/16632125?tab=holdings. Enter your zip code to find a library near you.