The Many Faces of Sherlock Holmes

Sometimes I watch things and then wonder what the heck that was. That was the feeling I had when I watched The Many Faces of Sherlock Holmes.
This was an odd little documentary charting the many forms of the world's most famous detective. It discussed the literary incarnation, and then the play adaptations, and then the movie and tv versions. It was kind of fun to see the detective change so many forms.
The one thing I don't understand was how they conned Christopher Lee into hosting this program. He's Christopher Lee! Guy could be doing anything with his time; why was he doing this?
I get the distinct impression this was created to promote a new Sherlock Holmes movie that was coming out right at the same time. (Around 1985)
But the program was set in the Sherlock Holmes Alehouse, which I've actually been too! And apparently, it hasn't changed in 25 years.
Of course, if this program was made now, it would have to talk about the awesome that is Robert Downey Jr. in the latest movie and Hugh Laurie as a Holmes-as-doctor in House.