Organization War Office

British Army

Public Record Office (1906-1912)

Royal Garrison Artillery (1916-1918)

Public Record Office (1920-1954)

Monuments, Fine Arts, and Archives Subcommission (1944-1945)

Surrey Archaeological Society

Surrey Record Society

British Records Association (joint honorary secretary | [1932, 1947] | vice-president | [1954, 1961])

Jewish Historical Society of England (president | [1953, 1955])

Society of Archivists (president | [1955, 1961])

University of Cambridge (F. W. Maitland memorial lecturer)

British Army (infantry | 1915-1919)

University College, Cardiff (lecturer in archaeology)

National Museum of Wales (Department of Archaeology)

Society of Antiquaries of London (fellow | 1930)

Society for the Promotion of Roman Studies (council | 1932-1935)

Archaeologia Cambrensis (editor | 1950-1955)

Cambrian Archaeological Association (president | 1953-1954)

Ancient Monuments Board for Wales (member | 1954)

Royal Commission on Ancient and Historical Monuments Wales (commissioner | 1955)

Governing Body of the Church in Wales

Hampshire Genealogical Society (founder member | 1973)

Birmingham & Midland Society for Genealogy & Heraldry (committee member)

Guild of One-Name Studies (steering committee | founder member)

Walcot Family Newsletter (editor)

Byrdsong (later 'WD40' and 'Parnham Voices' | local choir | founder member)

Beamish Music Festival

Pilsdon Trust (drug rehabilitation centre | supporter)

University of Aberdeen

Queen's University, Kingston

Christ's Hospital

Merton College, Oxford University

Radley College