Fantastic song: and the best version* (imho) is by Nancy Kerr and James Fagan.

There's a 'mystery verse' which has appeared somewhere along the line. A fellow Tudor Folker insists on a third verse about "A mile inland... A government stockade... well-made" or some such. But when I asked James Fagan about this, he said that he'd heard of that, too, but he got the song directly from John Warner, and he didn't write it!

* the second best is by me. ;^)