The Admirable Crichton.

William Crichton is the efficient butler in the London household of the Earl of Loam and his family. When Lady Catherine is arrested at a suffragette protest, he recommends the family take a trip on the Earl's steam yacht to the South Seas until the scandal dies down. When the yacht's motors explode during a storm, all are forced to abandon ship. The aristocrats land on a deserted island and Crichon rescues the still sleeping "tweeny" maid Eliza. After two years, the social order has been completely upended.