You're probably going to kick me for this, but I have to admit that I never really got it with David Farrar. He was a rather wooden and one note actor I thought and still can't quite fathom how he would entice even the nun from Black Narcissus into the frenzy that he did. Ditto for the J. Jones character in Gone to Earth (although that wasn't a particularly likeable part, so it's not entirely his fault I suppose.)
