Hi Jennifer
My G GM was Caroline Bessell, 2nd G granddaughter of John George who was also Rose's 2nd G GF. Caroline's father was Mowbray Bessell b. 19 Sep 1803 Mitcham, Surrey d.9 May 1865, Wollongong, NSW and his father Capt Charles Bessell b. 1767 London d.23 May 1845 Peckham, London and his father was the above John George Bessell b.abt 1738 London d. Mar 1796 London Road, London. The family originated in Mitcham, Surrey where some of Capt Charles' offspring were born.
I do have details of the wider Bessell descendants if anyone needs further information.
Brian