Funnily, I’m not sure there have been many other (or any other!) radio adaptations of the story in the modern/post-OTR era (other than talking books). So this is an hour long BBC Radio drama from 1985 and scripted by Glyn Dearman. It takes an unusual approach to the classic horror/mystery story by Robert Louis Stevenson — by actually sticking close to the source novel!
That is, though the story has been filmed and staged innumerable times over the years, usually the focus — logically enough — is on Jekyll/Hyde. But the original novel was actually written as a mystery, with another character, Utterson (here voiced by Bernard Hepton), as essentially the main hero, who finds himself investigating the strange events surrounding the sinister Mr. Hyde and trying to fathom the man’s connection to the respectable Dr. Jekyll who seems to be covering for him. It’s not really until half way through the novel that the solution is revealed — and then it retells the events from Jekyll’s perspective (such spilt-perspective mysteries were not uncommon in the 19th Century, including some Sherlock Homes novels).
So this radio drama decides to go back to basics, and tells the story as a mystery (though with the revelation serving as the climax of the story, as opposed to then launching into an entire second half detailing it). And even knowing the solution (as most people will) it’s an effective, intriguing approach (if only just as something different from the standard Jekyll/Hyde movies) — much as I found it intriguing when I first read the novel. And the production itself is well done, and briskly-paced. Obviously, the fantasy/horror aspect is less pronounced (since it only comes into play toward the end) but compelling nonetheless — and an interesting chance to perceive the story as Stevenson originally intended it, as a “mystery.”