This is good sound Wimsey; Carmichael carries off the characterization to my complete satisfaction, and the digitization is acceptable given the age of the original. Glyn Houston and the rest of the cast do quite well, and the script was faithful enough (unlike _Strong Poison_) not to conflict with my (admittedly not recent) recollection of the book, with the obvious exception necessitated by the change of medium.
One recommendation for viewers of the DVD set(s): The packaging suggests watching the books in production order; I'm watching them in the order the books were published, which entails watching this after the Edward Petherbridge _Strong Poison_. (Which I also recommend, despite the initial attempt at sensationalism in the screenplay. Petherbridge is obviously a more distinguished actor, though his characterization is darker—more lord and less whimsy, as one reviewer noted.)