I just listened to the first episode of The Adventures Of Sexton Blake. Apparently, Sexton Blake is a preexisting character whose first adventure was published in 1893. That may be so, but this radio show doesn't feel like any preexisting character - it just feels like a plain old Sherlock Holmes parody, with Blake (played by Simon Jones, who played Arthur Dent in The Hitchhiker's Guide To The Galaxy radio show and TV show) as Holmes and his assistant Tinker (played by Wayne Forester) as Watson.
It's funny, no doubt, but it's not original at all. Indeed, every joke in this show was done better by my favorite living author, Daniel Pinkwater, who created the character Osgood Sigerson for his Snarkout Boys books.
See...now you get the post title!