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

Oswald Vaughan Lloyd-Davies was born at Chariton, Kent on 13 January 1905, the son of Rev Samuel Lloyd-Davies BA, a congregational minister, and Anna Marguerita, née Evans. He was educated at Caterham School where he secured the Honoratus Prize before entering the Middlesex Hospital Medical School f