Sandford married Lettice Mackintosh Rate (1902-1993) on 7 December 1929 after meeting her on a skiiing holiday in Switzerland. They lived at Eye Manor.
He bought the Golden Cockerel Press in 1933 and developed it into a well known brand in the prewar era, with engraving works from famous artists including Eric Ravillous. After the war he sold the business in 1959 and opened Eye Manor to the public. He was a founding director of the Folio Society.
Commissioned 1941, Intelligence Corps. Intelligence Officer Monmouthshire and Herefordshire, using his home at Eye Manor his headquarters.
Possibly he was commissioned direct from the Home Guard to be Intelligence Officer as happened elsewhere.