He sang it (as Alan a'Dale) in "The Story of Robin Hood and His Merrie Men", Disney 1952. It came out as a video a few years ago, you might be able to find it somewhere if you hunted around.

Otherwise best known for his version of Edward Lear's Owl and the Pussycat, which was frequently on Children's Favoyrites on the BBC, backmin those days. I'd almost guarantee that if you start the first line with anybody in England of the appropriate generation, they'll be able to give you the rest of the song.