[1] His father, Sir Albert George Hadcock (1861-1936), was a distinguished engineer, who was made a Fellow of the Royal Society and appointed Knight Commander of the British Empire in 1918.
[6] In the summer of 1926 Hadcock married Jeanne Josephine La Pajolec, the marriage registered in Hexham, Northumberland.
[3] Engaging in private study after the war Hadcock produced a body of work on ecclesiastical buildings of Great Britain and the Irish Republic.
His collaboration with Dom David Knowles and Father Aubrey Gwynne, Society of Jesuits, as well as his own writings and map making, made a considerable contribution to the study of monasticism in the mediaeval period.
This collection of glass and film negatives, as well as prints, comprises mainly ecclesiastical and secular architecture.