Michael John Knight Hudson (always known as Mike) was a consultant general, vascular and breast surgeon in north Cambridgeshire and King's Lynn. He was born in Southgate, London, on 21 March 1936, the son of Kenneth Alfred Knight Hudson, an obstetrician and gynaecologist, and Eucharia Aloysius Marie

Michael McBrien was a general surgeon with an interest in urology at the West Suffolk and Newmarket hospitals. He was born on 4 July 1935 in Maidstone, Kent to Leo Patrick McBrien, a general practitioner, and Elizabeth Rosemary McBrien née Phillips, the daughter of a farmer, and had three sisters.