This British short film was produced in London and has the distinction of being animator, Richard Williams' [The Little Island, (1958) Who Framed Roger Rabbit (1988)] second project. Williams is an interesting figure. His work is inspired and inspiring, but, like Charles James, the famous couturier, he's found it difficult to complete and let go of projects, most notably his masterpiece, The Thief and the Cobbler, which was seized from his control by the completion bond company two years after it was funded and 24 years after it was begun.
This short is rare and hard to find. It can be seen only online as far as I've been able to surmise. Above is the entire film, uploaded to YouTube by TheThiefArchive.
Obscurity factor: 9 (not on DVD, difficult to find, on YouTube)