I have a book given to me by my mother-in-law in the 80's called "Barnes Ancestry" by Pamela Barnes. It is about the descendants of the1820 Settlers to South Africa - James and his brother George - children of Mary Barnes nee Dixon. When her husband died she teamed up with Henry Harper and went to South Africa with two of her children (the daughter who was left behind for some unknown reason followed in 1825) where she did finally marry him in 1928. I will add information to this family to the tree - in the mean time have added James and his brother to the project.
My mother-in-law thought that the Barnes line would link to this branch, but it was not the case - our Barnes line come from a family of Gardeners - have added one of the more well known to the project.