[5] A second acting Professorship, of Philosophy, arose at Sydney University, which Henderson filled, in 1900 returning to England, living at Kingham, and at Charlbury, in Oxfordshire, the home of his wife's parents.
[6] Early in 1902 Henderson was invited to give a course of lectures in Sydney, and while he was in Australia Professor Douglas peremptorily resigned, and the University of Adelaide offered him the chair of History (or perhaps his friend William Mitchell, professor of English and Philosophy, persuaded him to apply); he accepted and took up residence in North Adelaide.
By 1910 she was living with the newspaper editor Richard Henry Gretton, and Henderson instituted divorce proceedings.
[4] They settled on a rural property at Blackwood, but she was unhappy; he suffered a nervous breakdown and was hospitalised in June 1923 and insisted she leave him; they divorced on the grounds of incompatibility.
When the pair visited England in 1936 he arranged for Elsie to be presented to the court of King Edward VIII (later Duke of Windsor).