What they can do when no one can see them

The Ghosts of Motley Hall is a British children's television series written by Richard Carpenter and produced and directed by Quentin Lawrence for Granada Television, and broadcast between 1976 and 1978 on ITV. Five ghosts occupy the titular Motley Hall. Each hails from a different era and all—with the exception of newly deceased Matt—are unable to leave the confines of the building.