O Kay for Sound

OKay for Sound is a 1937 British comedy film directed by Marcel Varnel and starring the Crazy Gang troupe of comedians. After falling on hard times the members of the Crazy Gang are busking on the streets of London. However, they are hired as extras on a film set. After arriving at the studios they are mistaken for a group of potential investors and given free run of the studios, causing chaos.

Source: Wikipedia