The Amazing Mr. Blunden (1972)
"A mysterious, very old solicitor Mr. Blunden visits Mrs. Allen and her young children in her squalid, tiny Camden Town flat and makes her an offer she cannot refuse."
Based on the "The Ghosts" by Antonia Barber, "The Amazing Mr. Blunden" is another classic British movie for the Christmas season.
This is the last one of these that I'm going to post since you all hate free movies so much. Bah, humbug!