I'm a bit of a random forum lurker but I thought I'd just let everyone know of a little tipoff as to where you can (possibly) find a copy of it.
Anyone with access to a University library might have a bit of luck. I go to GU in Brisbane and a VHS copy (yeah VHS is blah but the point is it's there) of the entire 4 (I think) episodes can be viewed by anyone who goes in there (as it is technically a public library) or if you know somebody who goes to the Uni borrow their library card and get them out. Uni libraries have all sorts of random stuff in them and at the Nathan and Goldie campuses of GU there are 4 copies in total!
Yeah, so my little piece of advice is to go randomly raid a university library. It is actually quite an interesting documentary, and I incidentally stumbled upon it via a recommendation by a lecturer because it was simply interesting.
Hope I helped a little! =) I'll go back to my silent lurking again now.