Hello,
I was very excited to read your post and I believe we are related!
Julia Wickham was my great great grandmother (referred to as Go Go). I was looking over old family photos and saw a reference to her son I believe was Sydney Ramsay Cox!
Her daughter Julie Adelaide Elizabeth Ramsay Cox is my great grandmother (referred to as Mambo). I believe she was a very good horsewoman as well. She married Henry George Chapman who was a professor.
She had 3 children - Mary Gladys, Dorothy and Rupert. Mary Gladys is my grandmother.
I too have heard of the myth of Colonel Blood and would be very interested to read what connection there is, or anything else about Cox and Wickham.
I have been looking over old family photos (very lucky to have) and have seen photos relating to relatives in Kent, England together with photos taken in Australia where Julie Adelaide Elizabeth Ramsay Cox lived in Blackheath, NSW Australia.