Still Open All Hours S01E06 - Old Mother Hemlock's Ancient Remedies

Granville believes that the ghost of Arkwright is haunting the shop and he arranges a séance - actually to convince Madge to date Gastric, though of course it goes wrong. However he really does look as if he has seen a ghost when he gets a visit from the abrasive Linda - a face from the past who wants something that he has.