Hello Noel,
Johanna St John was my great-great grandmother which makes James St John my great-great-great grandfather. I am aware that he was transported to Botany Bay with a 7 year sentence for uttering forged coin.
You may well be aware of the tragic end that Johanna and her husband John MacPherson met in Toodyay. Their daughter Janet White was my great-grandmother and passed away when I was about 11. I remember visiting her at her home that she shared with her 2 daughters Ella and Ethel White.
Where does you ancestry follow from James?
Kind regards
Paul