Prudence and the Pill 1968

Synopsis:

Prudence Hardcastle is on the pill. So is her sister-in-law, but someone has been swapping aspirin for their pills. Is it the teenage niece, the maid, the chauffeur, a lover, Prudence's husband Gerald, or all of the above?

Directed by: Fielder Cook & Ronald Neame
Written by: Hugh Mills
Runtime: 92 minutes
Tagline: A sportive look at the fertility rites (and wrongs) of Western society.
Cast:
Deborah Kerr
Deborah Kerr
Prudence Hardcastle 
David Niven
David Niven
Gerald Hardcastle 
Robert Coote
Robert Coote
Henry Hardcastle 
Irina Demick
Irina Demick
Elizabeth Brett 
Joyce Redman
Joyce Redman
Grace Hardcastle 
Judy Geeson
Judy Geeson
Geraldine Hardcastle