Stanley Aubrey Jenkins was born in Cardiff on 3 April 1914, the son of Stanley Eugene Jenkins, chief clerk to a ship repairing firm, and Gladys Eliza, nee Bowers. He was educated at Cardiff High School before entering the University of Wales for his pre-clinical studies and graduating BSc in 1933 as

Peter Islwyn Hywel-Davies was born on 3 July 1914 at Abercynon, Glamorgan, and was educated at the Central School, Aberdare, and Cardiff University where he took the BSc degree in 1933. He then came to the Middlesex Hospital where he qualified with the Conjoint Diploma in 1936, and took the London M