Douglas William Claridge Northfield was born in London in February 1902. He received his medical training at Guy's Hospital, where he also qualified in dentistry. After qualification he did general surgery at Guy's where he was demonstrator in anatomy. He obtained the MB BS (London) with the Gold Me

Ascroft was born on 4 September 1906, the only son of James Arthur Ascroft of Bootle, Lancashire and Hannah Byers of Culton, Cumberland. He was educated at Worksop, the Middlesex Hospital, and the University of Strasbourg, qualifying in 1930; the next year he gained the gold medal at his Master of S

Geoffrey Knight was born on 4 October 1906 at Lowfield Heath, Surrey, the only son of Cureton Hope Overbeck Knight, a produce broker, and Ida Emily Norton, the daughter of a physician whose uncles served as surgeons in the Crimean War. He was educated at Wadham House School, Hove, and Brighton Colle