I'll Never Forget What's'isname 1967

Synopsis:

Advertising golden boy Andrew Quint is fed up with his fabulously successful life. In very dramatic fashion, he quits his job to return to writing for a small literary magazine. He wants to leave his former life behind, going as far as saying good-bye to his wife and mistresses. He finds, however, that it's not so easy to escape the past.

Directed by: Michael Winner
Written by: Peter Draper
Runtime: 99 minutes
Tagline: He smashed up his desk, gave up a wife, three mistresses and went back to the simple life. Then his troubles really started!
Cast:
Oliver Reed
Oliver Reed
Andrew Quint 
Orson Welles
Orson Welles
Jonathan Lute 
Carol White
Carol White
Georgina Elben 
Harry Andrews
Harry Andrews
Gerald Sater 
Michael Hordern
Michael Hordern
Headmaster 
Wendy Craig
Wendy Craig
Louise Quint