I didn't realise that the Cave Map page on this site listed all the Official Versions at the top, I was purposely avoiding it because I wanted to "discover" the Caves for myself and not sneak a peek at a map.
It probably is the Dr Watson one, the context I have seen it written in made me think it was a "lost" official version or maybe the first arcade version.
I can now see that Fans have been making and distributing their own BD Games for ages and Dr Watson's is probably more commonly refered to as BD4 in the BD Community.
Obviously I'm still learning the Terminology used or as some might say Rockford's Native tongue