Charles Geoffrey Rob was born at Skipton Hall, Skipton, Thirsk, Yorkshire on 23 April 1909. His father was Henry Rob, a farmer, and his mother was Muriel Carter Mitchell, whose father was a general practitioner. He was a cousin of Charles Granville Rob, the vascular surgeon, who was Professor in Lon

Brian McNeill Truscott was born in Hampstead on 29 February 1912, the son of Samuel John Truscott, Professor of Mining Engineering at the Royal School of Mines and Mary Truscott (née Vaughan). He was educated at Oundle School and the Middlesex Hospital where he held resident appointments after quali