It is easily missed that George Henderson used the pseudonym “Henry Durbanville.” He spent much of his time in South Africa. Durbanville is a large residential/commercial area outside Cape Town. Some of its history is found at https://en.wikipedia.org/wiki/Durbanville.
Mr Henderson was the General Secretary of the YMCA in Durban, Natal (1927-1930).

Does someone perhaps know more of his movements and ministry in South Africa?