Watched "The Clergyman's Daughter" from the Tommy & Tuppence series Partners in Crime. An apparently haunted mansion, a poltergeist frightening off paying guests, and buried treasure. This one was truly exciting.
There were changes in the detectives' office decor, most notably a gorilla bust and a faux zebra sofa throw. This episode was set in the Christmas season, and so there was also a decorated tree.
Loved Tuppence's Gloria Swansonesque disguise!