Re Aussie singer, Di McNicol,
I found another 6 folk tracks c.1976, on Soundcloud under Terry Chapman :

https://soundcloud.com/terry-chapman-152583044/sets/di-mcnichol-circa-1977

and she was also in the c.1988 show "The [magic] Pudding" :
https://www.discogs.com/Brian-Appleford-And-Louis-McManus-Songs-From-The-Pudding/release/10787343


But perhaps she deserves her own thread?!

Cheers,
R-J