".. I might chase the deed up one day, but for now I'm keen to find George Randall's parents in England."
This is not incidental to researching the origins of George RANDALL. The circumstances of the changing ownership of Dingley Dell are important because they are a test of the credibility of the notes you are using. At this stage, it would seem that the notes of another researcher are all you have to work with. I am not suggesting that you access the files for transfer of property ownership, but you need to question the information that you are working with.
And if this is the source of the information that you are using, and giving to a forum, you need to consider the accuracy of the notes. When was this research done....five years ago...twenty years ago? When were the notes compiled?
Looking at online information about Adam Lindsay GORDON, I am seeing that he bought Dingley Dell.
Where you see your George RANDALL as a publican, he is the person who applies for a liquor license. He is not the owner of a hotel.
"..... obituary of a George Randall in a newspaper in which it said he had a wife and children in Port MacDonnell and died without a will."
The probate file for George RANDALL, died Victoria, states that he died intestate, and that he had a family in Port Macdonnell and had left them about thirty years earlier.
Have you located a newspaper obituary for him?