What you want to do is type chickens in the garden into the "Digitrad and Forum Search" which you may have seen on the main Forum Page. Hit "GO". One of the results you will get isThis is the DT file and, though no source is credited, it appears to be the Watersons' set with a few small typos and mis-hearings. They learned the song from Joe Udal at a shepherds' meet in the Lake District, around 1974.