Upset that a Victorian mansion is to be torn down and replaced by ""a block of flats,"" Hester starts a campaign to persuade local councillor Mr. Gardner to convert the premises into a seniors' residence. When he doubts the need for such a facility, Hester invites him home, having persuaded Nancy, her sister Winnie, and Guy to pretend senility. The appalled Gardner not only approves the home but telephones to notify William and Hester that he has arranged for their dotty dependents to move in immediately.... (thetvdb.com)