I also produced a version of Tam Lin in the 60s which I collated from versions in Johnson's SMM and sources in the British Library. It was recorded by Alastair McDonald and was intended as a backgroung track to a modern film version of Tam Lin featuring Iain McShane. Instead of horses, the film used racing cars of different colours and some magical scenes when Tam was turned into all kinds of weird creatures. The album, Tam Lim, which I produced and arranged, was released in 1970 on Young Blood records but I don't think the film saw the light of day.