Hi I have just started researching this side of the family, even though I grew up knowing Jack, my mother never spoke of her mother, I found news of the very public divorce on Trove and have the marriage certificate which is why I know her maiden name, as well as the newspaper clippings, but other than that I don't have anything. I suspected she remarried given the divorce petition mentions her affair but not the name of the other party.
I was quite surprised to read this old post and it can only be my grandmother May Arnott/Neville, Jack was NSW Police until he retired and my uncle Jim lived in Melbourne, died recently. Any chance you recall second husband or parents details?
cheers J