Jones was a native of Wigton in Cumbria, and went to the Nelson-Thomlinson school in that town. A graduate of Christ's College Cambridge where he read History, he became an officer in the Royal Artillery during World War II and served as a civil servant in the pre-independence Government of Sudan.The Defence of the Realm, by Christopher Andrew, Page 556, Published by Allen Lane, 2009, ISBN 978 0713998856 He joined the Security Service in 1955.