I got the original tune and accompaniment off a beat-up tape Bill Berry made in Brisbane in 1961 and learned it when I started to play the guitar in 1964. I taught it to Adele and she began singing it in folk gigs a couple of years later. We taught it to the Fagans who have just recorded it.I ran into Bill ten years ago in the Blue Mountains and played it and his other excellent songs from that tape back to him; he remembered them well and it sounds like it has spurred him on to perform them again.
The "Dream of the morning with a cock in his hand" juxtaposition is due to Merv Lilley who never was keen on sentiment - makes it a bit hard to sing the song seriously once you've heard it.
However I've always had a sneaking idea, given her interests, that Mum wrote it that way on purpose.
I will have to ask Martyn Wyndham-Read what his tune is - he has never admitted writing a third one!