Es könnte sich um "Auch Arbeit kann von Übel sein" ("Work is a Four Letter Word") von 1968 mit David Warner und Cilla Black handeln.
Hab ich leider nie gesehen, aber Tante Wiki sagt unter anderem:

"Everyone is employed by the ultra-modern DICE Corporation but Valentine Brose (Warner) would rather stay at home to tend his psychedelic mushrooms. However, his bedroom is too small and his fiancee Betty Dorrick (Black) wants him to settle down. Accordingly, Brose seeks a job in DICE's boiler-room, a suitable environment to grow his mushrooms."