I asked my friend last night and here was his response. Please keep in mind that his primary language is not English.
"I will explain about documentary you asked. I saw the information of documentary. I don't have this but I have others great. I have one called "A Study in Sherlock" from BBC programme "Time Shift". Is near one hour and was done in 2004/2005 I think. Is very interesting because has clips about Sherlocks from William Gillette to Rupert Everett. Appears some investigators in Sherlockiana and clips of Peter Cushing, Basil Rathbone, John Barrymore.
If you wanted to answer in BritForum, you can say to the person who asked for Sherlock documentaries that I have the documentary I said and another great called BAKER STREET BABYLON: THE BIZARRE AFTERLIFE OF SHERLOCK HOLMES (TIME SHIFT) A compendium of clips of the strangest Sherlocks ever seen on screen, from John Cleese, Japanes Sherlock to Roland Rat."
So, there you are, Billy Farmer. This person is very generous with his films, and is very passionate about all things Sherlockian.
Ruth