Titles read: "Now Pathetone Presents - Those Famous International Dancers TRACEY & HAY From Palladium, London, etc."
London, probably Pathe Studio.
Various shots of dance act Sid Tracey and Bessie Hay doing a routine that consists mostly of Bessie dancing about gracefully on points and being lifted by Sid to slow music. He wears a white suit, she wears a little white and sparkly two-piece costume. At the end, Sid lifts Bessie above his head by her leg and walks off-camera with her.
Note: according to Denis Gifford book, the music is "The World Is Waiting For The Sunrise".