I am wondering if my Great Great Grandfather John Bartlett (dob 1847) is a brother to your relatives, the reason i ask is that in the early 1900's John Bartlett's son John Henry (dob 1873)went to Sth Aftica also. Some of his children also settled there. His wife Sophia Emma Maria nee Wright last known address in the 1920's was Port Elizabeth Sth Africa. Plse contact me if this is useful.
Regards Kerry (NZ) My Bartletts where from Blandford Dorset and Hants Boscombe