Albert Ketèlbey (1875 - 1959) was an English composer, conductor & pianist born in Birmingham. He became famous for composing popular light music, much of which was used as accompaniments to silent films, and as mood music at tea dances.
You can read a full biography here - http://www.albertketelbey.org.uk/albert.html
This third video is Ronnie Ronalde whistling over the melody. He was never off the radio in the fifties and was popular with my parents' generation; maybe not popular but certainly different!