I've been curious of their audio-dramas for awhile and gave 'A Christmas Carol' a listen a few days ago. It stars Sylvester McCoy who gives a fantastic performance of Scrooge. Some of the other actors aren't that great, and the music is overdone as well. Just a shame it is so short @ 42 minutes, like all their other productions they are heavily abridged. For example 27 minutes for Dracula.
Other audio-dramas they've produced: 'Casting the Runes' with David Warner, 'The Hound of the Baskervilles' with Sir Derek Jacobi.