Does anyone recognise the group in this photograph?

Wonderful old photo, probably around 1903/1904, taken in South Africa - Ermelo, Transvaal region. My grandmother has a blue mark. We believe this is a missionary group from the UK, probably Wales, but don’t know for sure.

Does anyone recognise the group or know anything about a missionary to the area? Would love to hear any comments or thoughts.

Doreen - doreen.lawson@btinternet.com