It was 20 years ago that David Chaplin, a retired headmaster from a prep school in East Sussex, first arrived in Africa. For many years his school, the peaceful, leafy Vinehall (its motto: pro aliis optimum agere, “to do our best for the benefit of others”), had been in contact with the Anglican church in South-west Rwanda through the father of one of his pupils, and it regularly raised money for children there. Having retired with a full pension at the age of 55, Chaplin decided it was time to