I did not realize it was based on an older ballad.. http://www.lukehistory.com/ballads/worldup.html

here is some background on the Digger community by the
man who wrote this song.
http://www.youtube.com/watch?v=594JpY2ahFg

(the song starts at 2:50) This rare concert footage of
Leon Rosselson was recorded in Edinburgh in October 2007.