He was one of the 14 committee members who served on the Wolfenden Report on Homosexual Offences and Prostitution.
[11][13][14] Demant had originally intended to become a Unitarian minister, but became attracted to Catholicism while studying at the University of Oxford[13] and was received into the Church of England in 1918.
[16] From 1929 to 1933, he was an assistant priest at St Silas Church, Kentish Town.
[23] He supported Maurice Reckitt in founding the Christendom Trust to encourage and fund research into the application of Christian social thought.
Demant retired from his post at Oxford to a cottage in Headington, Oxfordshire, in 1971.