Brian Field ( 15 December 1934 – 27 April 1979 ) was a solicitor 's clerk who was one of the masterminds of the 1963 Great Train Robbery . He was the crucial link between the key informant known only as " '' Ulsterman '' " ( who came up with the idea of robbing the money-laden night mail train and also provided the details of the schedule and contents of the trains ) with the actual gang capable of planning and carrying out such a complex and large scale robbery . He was found guilty of Conspiracy to Rob but his conviction was later overturned on appeal . Field only served time in prison for Obstruction of Justice in relation to arranging the purchase of Leatherslade Farm , near Oakley , Buckinghamshire which was used as the gang 's hideout
Great Train Robbery
Great Train Robbery (1963)
Brian Field