Comprises:
- Records of Lord Holfords international visits: Australia (D147/AU) from the 1950s on and relating to his role as consultant from 1958 to 1970 to the National Capital Development Commission, Canberra; South Africa (D147/SA) regarding his development plan for the City of Durban in conjunction with R.H. Kantorowich, as planning consultant to the City of Pretoria, consultant for the Cape Foreshore Project and an assessor in a competition for Johannesburg Civic Centre.
- Consultancy papers (D147/C): reflecting the diversity of Lord Holford's work in the UK as an individual or through his firms; covering his involvement in plans for the reconstruction of post-war London (with C H Holden), Piccadilly Circus, the Precincts of St Pauls, Cambridge and Corby (with H M Wright), the Army Museum Chelsea, United Liverpool Hospitals and Eton College; he acted as consultant to the expanding Universities in the late fifties and early sixties, Oxford and the University College of Wales at Aberystwyth.
- Central Electricity Generating Board (d147/EB) of which Lord Holford was a part-time member from 1958 to 1973.
- Financial Papers (D147/F): matters relating to the running of Lord Holford's firm of William Holford and Partners, based in London, Liverpool and Edinburgh.. Historic Buildings Council Papers from 1953-1975. These records are not complete, though contains routine correspondence of Lord Holford with his accountant, H.W. Pople of Liverpool.
- Lectures and Articles (D147/LA): texts of lectures given by Lord Holford plus lecture notes, texts of articles, invitations to lecture which were refused, also includes notes for lectures at University College London. He meticulously preserved the texts of all the lectures and articles. Other papers from University College are to be found in their own section (D147/UCL), but these are very piecemeal concentrating only on departmental matters around the middle sixties and do scant justice to Lord Holford's tenure of the Chair of Town Planning.
- The Membership of Societies (M): correspondence and papers of particular groups and societies, such as various Brighton and Hove Societies, the Civic Trust, the Georgian Group and the London Gardens Society, includes also professional clubs such as the Surveyors Club and the Bond.
- Personal material (D147/P): contains Lord Holford's diaries, notes, private correspondence, personal documents, biographical notes and list of publications, press cuttings and details of his properties in Liverpool (80 Bedford Street), London (5 Cambridge Terrace and 20 Eccleston Square) and Brighton (133 Maring Parade).
- Records of the Royal Institute of British Architects (D147/RBA): during the years of Lord Holford's presidency his activities and the influence he was able to bring to the questions of architectural politics of the time.
- Staff and References (D147/SR): wide variety of references by Holford, also includes applications for positions within his own firm.
- Trustee (D147/T): contains complete sets of agendas, minutes and papers for the periods during which Lord Holford was associated with particular committees.
- Other Activities section (D147/OA): includes records relating to Holford as an assessor in various competitions and projects, includes Calder Bridge, Yorkshire and New Ways, London, The Commonwealth Arts Festival of 1965, The Countryside in 1970, as well as his work for the Artists General Benevolent Institution and for the Architectural Association.
- A further deposit of material used by Mr. Richard Gray, a partner of Lord Holford in writing a biography (D147/8): includes various personal papers, a Biography, projects and writings by Holford, photographs, negatives and slides, correspondence and Marjorie Brooks' personal papers.