Blithe Spirit is a 1945 ghost story/comedy directed by David Lean and starring Rex Harrison, Constance Cumings, Margaret Rutherford, Hugh Wakefield and Marie Ault. It's not as readily available singly. They seem to want you to spend $50+ to get it along with several other David Lean films in a box set I don't want.
Some of it is available online. part 1:
Blithe Spirit (Part 01) Meowsjr =^.^=
part 2, part 3, part 4, part 5 (deleted)
Moria gives it 3 stars and says, "the film is fairly much stolen by that grand old dame of the British theatre, Margaret Rutherford, who sweeps the whole show up with her daffy presence in the role of the medium." Variety praises the acting and the camera work.