Snowdo-de-o-do Pictures present a Nit Film! A comedy short or a Sellers home video (as you like it) made in 1964, featuring Princess Margaret, Lord Snowdon and Britt Ekland.
In late 1964, when he was at the height of his success, Peter Sellers
filmed a series of vaudevillian sketches with a group of wealthy and
socially elite friends. He edited the scenes together into a movie and
called it I Say I Say I Say. (see more info at the below link)