After I sent the previous post I decided to explore it further and found the newspaper cutting. I then went back to the archives and have found three possible John's who died in 1892, 1901 and 1902. Unfortunately only marriages are on line for St. John's Baptist Church of England, Tembu Location.
I also found a link to a site which gives two children born to Amelia and John - Isabel Maude and Kathleen - however neither of these was married to Charles! The newspaper reports seem to indicate that they lived at the mission so logic says that John probably remained there after she died, but logic and what actually happened are often two totally different things!
This obviously requires some more searching
