Ian Carmichael portrays "Windrush," who is artfully maneuvered by his uncle, “Tracepurcel,” played by Dennis Price, into accepting a position at the family’s factory—not in a supervisory role, but as an ordinary worker. Almost immediately, his presence stirs up resentment from shop steward "Kite" (Peter Sellers), who seems unsure whether he's frustrated that this person was hired without union input or worried they might be dismissed if someone complains to management, which is embodied by Terry-Thomas. The question of a strike becomes central to this amusing satire, which mocks the stubbornness of a union inclined to oppose nearly everything and a managerial class focused solely on personal enrichment. This latter point is effectively shown through the performances of Price and Richard Attenborough, whose character is trying to steal a valuable £1.5 million contract from "Mr. Mohammed" (Marne Maitland). A wonderful collection of well-known British actors contributes to the film's charm—Margaret Rutherford, Miles Malleson (typically quite disheveled), Liz Fraser, and Irene Handl all participate in this parody of rigid beliefs and outdated family business customs that allowed those in charge to essentially inherit their positions. Sellers, Price, and Carmichael are excellent, showcasing the absurdity of British industrial relations during the 1950s, and it remains a relevant satire even after nearly sixty-five years, making it well worth seeing.

Source on TMDB