Very good episode - after all these adaptations of Stevenson I feel that I should read them.  I thought the voice of the imp was strange, but perhaps they were feeling funny at the time they recorded it.  It was a good moral development story for the main character I think and even his ex-wife in the end.  The recording wasn't the best (very hard to hear at several points) but luckily I was listening on my computer rather than in my car.