All the Way Up (film)

All The Way Up is a 1970 British comedy film directed by James MacTaggart based on "Semi-Detached", a 1962 play by Midlands dramatist David Turner. It stars Warren Mitchell, Pat Heywood, Kenneth Cranham, Richard Briers, Adrienne Posta and Elaine Taylor.
The film is rated M in New Zealand for sex scenes and sexual references.
Premise.
A social climbing father uses everything from poison pen letters to blackmail in order to gain promotion and wealth for his children through marriages.