I was wondering whether to start a thread about that too Babyjane but thought I might get branded a telly addict

- it is properly spooky like old fashioned ghost stories used to be. I think I read that it was written, produced or directed by the same team that used to do the BBC Christmas night ghost stories years ago. It is certainly very atmospheric and I am looking forward to tomorrow nights episode.
I've just checked in the paper and it says it is evocative of the ghost stories of MR James adapted by the BBC in the Ghost Stories for Christmas dramas in the early 70's, I remember they really used to scare me when I was a teenager.