Cyril Fletcher ('Peter') Critchley was born on 7 July 1909 in Dulwich, south London, the son of James Critchley, a barrister, and his wife Margaret, née Fletcher. He was educated at Dulwich College and St Thomas's Hospital, and qualified in 1934. As a student, he fenced for London University. His

Lionel Zelick Cosin, son of Benjamin Cosin, a tobacconist, and his wife Mary, née Magoon, was born in London on 8 November 1910. He was educated at Westminster City School and Guy's Hospital Medical School, qualifying in 1933. His brother, the radiologist Dr C F Cosin, was senior to him at Guy's. Hi

Frank Nicholson was a senior surgeon at Manchester Royal Infirmary. He was born in Cheshire on 6 September 1909, the son of Charles James Nicholson, a cotton merchant. Educated at St Bee's School, Cumbria, he had a distinguished academic record before proceeding to St Catherine's College, Cambridge,

Eric Vernon was born on 29 November, 1909, in Marple, Cheshire, the son of Arthur Vernon, furnisher and antique dealer. He was educated at Stockport Secondary School (Hallam Scholar) and Manchester University where he graduated BSc in 1930 and MB, ChB in 1933, winning prizes for pathology and paedia