I think you'll find that the guy in the B&W pic you posted is Ian McKellan Garrett.
Night of the Demon is a gem! Got this DVD a while back. Yes, it does have two versions of the movie. The UK cut,
Night of the Demon (as opposed to
Curse of... in the US) is the complete cut of the movie.
ITV Playhouse in the late '70s did an adaptation of this story too with a female lead (Jan Francis in the Dana Andrews role) and Ian Cuthbertson as Karswell. Still got this on tape - hoping against hope for a DVD release.
As to
Tales of Mystery and Imagination, this is one hell of a creepy series. No frills, old fashioned ghost/horror stories. Saw a few of them a while back at a classic TV retrospective at the NFT, and they still deliver the chills.
Also read a few years ago that the complete run of this series was located in pristine condition in the vaults of Central Television, but since then not a word...
I think what counts against this getting TV repeats is the fact that with the exception of a six 90 min colour stories (among them
Frankenstein Ian Holm,
Dracula Denholm Eliott and
Sweeney Todd Freddie Jones) made in the last two seasons in an attempt to revive the series, all the others are in B&W.