- AHRC Research Centre for the History and Analysis of Recorded Music
- Aberdeen City and Aberdeenshire Archives (Aberdeen City)
- Aberdeen City and Aberdeenshire Archives (Aberdeenshire)
- Aberdeenshire Museums Service
- Aberystwyth University Archives
- Ahmed Iqbal Ullah Race Relations Resource Centre
- Alexander Library of Ornithology, University of Oxford
- Amaravati Buddhist Monastery Archives
- Amnesty International, International Secretariat
- Anthony Burgess Foundation Archives
- Archifau Sir Ddinbych / Denbighshire Archives
- Archifau Sir Gaerfyrddin / Carmarthenshire Archives
- Archifau Ynys Môn / Anglesey Archives
- Archifdy Prifysgol Bangor / Bangor University Archives
- Architectural Association Archives
- Archive of Garden Design
- Archive of Recorded Church Music
- Archives Hub Admin
- Archives of IT
- Arundel Castle Archive
- Ashmolean Museum Department of Antiquities, University of Oxford
- BBC Written Archives Centre
- BP Archive, University of Warwick
- BT Group Archives
- Balliol College Historic Collections
- Barclays Group Archives
- Barking and Dagenham Archive and Local Studies Centre
- Bethlem Museum of the Mind
- Bill Douglas Cinema Museum, University of Exeter
- Birkbeck Library Archives and Special Collections, University of London
- Birmingham Archdiocesan Archives
- Birmingham Archives and Heritage Service
- Birmingham City University Arts, Design and Media Archive
- Bishopsgate Institute Special Collections and Archives
- Black Cultural Archives
- Bodleian Art, Archaeology and Ancient World Library
- Bodleian Library, University of Oxford
- Borthwick Institute for Archives, University of York
- Bournemouth University Archives
- British Antarctic Survey
- British Cartoon Archive
- British Film Institute
- British Institute at Ankara Digital Repository
- British Institute for Libyan and Northern African Studies
- British Library Asia, Pacific and Africa Collections
- British Library Manuscript Collections
- British Library Music Collections
- British Library Sound Archive
- British and Foreign Bible Society Library
- Britten Pears Arts Archive
- Brunel University London Special Collections
- Bury Archives
- Cambridge Philosophical Society
- Cambridge University Archives
- Cambridge University Library
- Cambridge University Library Map Department
- Cambridgeshire Archives
- Canterbury Cathedral Archives
- Canterbury Christ Church University Archives
- Cardiff University Archives / Prifysgol Caerdydd
- Carsphairn Archive
- Centre for Contemporary Arts
- Centre for Ecology and Hydrology, University of Oxford
- Centre for the Study of World Christianity, University of Edinburgh
- Chelsea College of Arts Library, Special Collections
- Chetham's Library
- Children's Society Records and Archives Centre
- Christ's College Archives, University of Cambridge
- Churchill Archives Centre, University of Cambridge
- Clare College Archives, University of Cambridge
- Cockburn Association
- Conway Hall Humanist Library and Archives
- Cotesbach Educational Trust Archive
- Courtauld Institute of Art
- Coventry History Centre
- Coventry University Archives
- Crafts Study Centre Archives, University for the Creative Arts
- Cramond Heritage Trust
- De Montfort University Archives and Special Collections
- Dean Heritage Centre
- Doncaster Archives
- Downing College Archives, University of Cambridge
- Dr Williams's Library
- Dudley Archives and Local History Service
- Dumfries and Galloway Heritage Service
- Dundee Local History Centre
- Durham University Archives
- East Dunbartonshire Archives - Bearsden
- East Dunbartonshire Archives - Kirkintilloch
- East London Mosque Archives
- East Midlands Oral History Archive (EMOHA)
- Edge Hill University Archives
- Edinburgh University Library Heritage Collections
- English Faculty Library, University of Oxford
- English National Ballet Archives
- Explore York Archives
- Faculty of Classics Archives, University of Cambridge
- Feminist Archive North
- Ffotogallery Archive
- Fireground
- Freshwater Biological Association Archives
- GSK Heritage Archives
- Garstang Museum of Archaeology Archives, University of Liverpool
- Geological Society Archives
- Girton College Archives, University of Cambridge
- Gladstone's Library Archives
- Glamorgan Archives / Archifau Morgannwg
- Glasgow Caledonian University Archives and Special Collections
- Glasgow City Archives
- Glasgow School of Art Archives and Collections
- Glasgow Women's Library
- Gloucester Cathedral Library
- Goldsmiths Special Collections and Archives, University of London
- Granton Archive Project
- Guardian News and Media Archive
- Gunnersbury Park Museum Archives
- Gwasanaeth Archifau Conwy / Conwy Archive Service
- Gwent Archives / Archifau Gwent
- Gwynedd Archives Service - Caernarfon Record Office / Gwasanaeth Archifau Gwynedd, Archifdy Caernarfon
- Gwynedd Archives Service - Meirionnydd Record Office / Gwasanaeth Archifau Gwynedd, Archifdy Meirionnydd
- Hackney Archives
- Hallé Concerts Society
- Harlaxton Manor Archives
- Harris Manchester College Archive, University of Oxford
- Henry Moore Institute Archive
- Hereford Cathedral Library and Archives
- Heriot-Watt University Museum and Archive
- Heritage Quay, University of Huddersfield
- Highgate Literary and Scientific Institution
- Homerton College Archives, University of Cambridge
- Hull University Archives, Hull History Centre
- Hurd Library
- Ibstock Place School
- Imperial College London, Archives and Corporate Records Unit
- Imperial War Museum Archives
- Institute of Commonwealth Studies Library, University of London
- Institute of Education Library and Archives, University College London
- Institute of Latin American Studies Special Collections, University of London
- Institute of Modern Languages Research, University of London
- Institution of Engineering and Technology Archives
- Institution of Mechanical Engineers Archive
- Islamic Relief Archive
- Isle of Man Public Record Office
- Islington Local History Centre Special Collections
- Jersey Archive
- Keble College Archives, University of Oxford
- Keele University Archives and Special Collections
- Kettle's Yard Museum and Art Gallery, University of Cambridge
- King's College Archives, University of Cambridge
- King's College London Archives
- Kingston University Archives and Special Collections
- LSE Library Archives and Special Collections
- Labour History Archive and Study Centre
- Lambeth Archives
- Lambeth Palace Library
- Lancashire Archives
- Lancaster University Archives
- Leeds Conservatoire Jazz Archive
- Leonard Cheshire Archive
- Liddell Hart Centre for Military Archives, King's College London
- Lincoln College Archives, University of Oxford
- Liverpool Hope University Archives and Special Collections
- Liverpool John Moores University Special Collections and Archives
- Liverpool Medical Institution Archives
- Lloyd's Register Foundation Heritage and Education Centre
- Lloyds Banking Group Archives (Edinburgh)
- Lloyds Banking Group Archives (London)
- London Metropolitan University Special Collections
- London Museum Archive
- London School of Hygiene and Tropical Medicine Archives
- London South Bank University Archives Centre
- Lothian Health Services Archive
- Loughborough University Archives
- Lucy Cavendish College Archives, University of Cambridge
- Manchester Archives and Local Studies
- Manchester Metropolitan University Special Collections, Archive Collection
- Manchester Museum, University of Manchester
- Manx National Heritage Library and Archives
- Marks and Spencer Archive
- Marx Memorial Library & Workers' School Archives
- Merseyside Maritime Museum, Maritime Archives and Library
- Middle East Centre Archive, St Antony's College, University of Oxford
- Middlesex University Special Collections
- Mills Archive
- Modern Records Centre, University of Warwick
- Monmouth Castle and Regimental Museum Archives
- Murray Edwards College Archives, University of Cambridge
- Museum of English Rural Life
- Museum of Freemasonry
- Museum of Natural History, University of Oxford
- Museum of Zoology Archives, University of Cambridge
- Museum of the History of Science, University of Oxford
- Museum of the Scottish Shale Oil Industry
- NHS Lanarkshire Archives
- NatWest Group Archives
- National Aerospace Library
- National Army Museum’s Institutional Archive
- National Arts Education Archive
- National Co-operative Archive
- National Collection of Aerial Photography
- National Fairground and Circus Archive, University of Sheffield Library
- National Gallery Research Centre
- National Jazz Archive
- National Library of Scotland
- National Library of Wales / Llyfrgell Genedlaethol Cymru
- National Meteorological Archive
- National Motor Museum Motoring Archives
- National Museums Scotland Library
- National Portrait Gallery Archive
- National Railway Museum Archive
- National Theatre Archive
- Natural History Museum Archives
- Nazarene Theological College Archives
- Neath Antiquarian Society Archives
- New College Archives, University of Oxford
- Newcastle University Special Collections and Archives
- Newcastle University, Hatton Gallery Archive
- Newcastle University, Marine Technology Special Collection
- Newnham College Archives, University of Cambridge
- North East Wales Archives - Flintshire / Archifau Gogledd Ddwyrain Cymru - Sir y Fflint
- North Lanarkshire Archives
- North of England Institute of Mining and Mechanical Engineers
- Northamptonshire Archive Service
- Nottingham Trent University Archives
- Nuffield College Archives, University of Oxford
- Oxford Brookes University Special Collections and Archives
- Oxford Centre for Methodism and Church History
- Oxford House Archive
- Oxford University Archives
- Oxfordshire History Centre
- Panacea Charitable Trust Archive
- Paul Mellon Centre for Studies in British Art
- Pembrokeshire Archives and Local Studies / Archifdy Sir Benfro ac Astudiaethau Lleol
- Powys Archives
- Pusey House Library
- Queen Mary Archives, University of London
- Queen Square Library Archive and Museum, University College London
- Queen's University Belfast Special Collections & Archives
- Rambert Archive
- Regent's Park College Archives, University of Oxford
- Richmond upon Thames Local Studies Library and Archive
- Rose Bruford College of Theatre and Performance - Special Collections
- Royal Academy of Dance Archives
- Royal Albert Hall Archive
- Royal Asiatic Society Archives
- Royal Astronomical Society Archives
- Royal Ballet School Special Collections
- Royal Botanic Garden Edinburgh Archives
- Royal College of Art Special Collections
- Royal College of Nursing Archives
- Royal College of Obstetricians and Gynaecologists Archives
- Royal College of Paediatrics and Child Health Archive
- Royal College of Physicians and Surgeons of Glasgow Archives
- Royal College of Physicians of Edinburgh Library & Archives
- Royal College of Psychiatrists Archives
- Royal College of Surgeons of Edinburgh Archive
- Royal College of Surgeons of England Archives
- Royal College of Veterinary Surgeons Trust
- Royal Commission on the Ancient and Historical Monuments of Wales / Comisiwn Brenhinol Henebion Cymru
- Royal Commonwealth Society Library
- Royal Conservatoire of Scotland Archives & Collections
- Royal Free Hospital Medical Library
- Royal Greenwich Observatory Archives
- Royal Holloway Archives and Special Collections, University of London
- Royal Horticultural Society Lindley Library
- Royal Institution of Great Britain Archive
- Royal Northern College of Music Archives
- Royal Society Archives
- Royal Troon Golf Club
- Royal Welsh College of Music and Drama Archives
- Salford Local History Library
- Salomons Estate Museum
- Salvation Army International Heritage Centre Archive
- School of Oriental and African Studies (SOAS) Archives, University of London
- Schroder Archive
- Science Museum Library
- Scott Polar Research Institute Archives, University of Cambridge
- Scottish Borders Archive & Local History Centre
- Scottish Ornithologists' Club Archives
- Scottish Poetry Library
- Sedgwick Museum of Earth Sciences, University of Cambridge
- Senate House Library Archives, University of London
- Seven Stories Archive
- Shah Jahan Mosque
- Shakespeare Institute, University of Birmingham
- Shakespeare's Globe Library and Archives
- Sheffield City Archives and Local Studies
- Sherardian Library, University of Oxford
- Socialist Party of Great Britain Archives
- Society of Antiquaries of London
- Society of Writers to His Majesty’s Signet
- Solent University Library
- St George's Archives and Special Collections, University of London
- St John's College Library Special Collections, University of Cambridge
- St John's College Library, University of Oxford
- St Paul's Cathedral Architectural Archive
- Staffordshire University Special Collections
- Staffordshire and Stoke-on-Trent Archive Service
- Standard Life Aberdeen Archive
- Surrey History Centre
- Swansea Museum
- Swansea University Archives
- TUC Library Collections, London Metropolitan University
- Tasglann nan Eilean
- Tate Archive
- Taylor Institution Library, University of Oxford
- Thackray Museum of Medicine
- The Centre for Computing History, Cambridge
- The Devonshire Collection Archives, Chatsworth
- The Goldsmiths' Company Library and Archive
- The Hockey Museum
- The Open University Archive
- The Postal Museum
- The Rothschild Archive
- The Stationers’ Company Archive
- The Wiener Holocaust Library
- Theatres Trust Resource Centre
- Transport for London Corporate Archives
- Trinity College Archives, University of Cambridge
- Trinity Laban Conservatoire of Music and Dance, Faculty of Music Archive
- Trinity Laban Conservatoire of Music and Dance, Laban Archive
- UK Data Archive
- University College London Archives
- University for the Creative Arts Archives & Special Collections
- University of Aberdeen Collections
- University of Bath Archives and Research Collections
- University of Bedfordshire Special Collections
- University of Birmingham, Cadbury Research Library, Special Collections
- University of Bradford Special Collections
- University of Brighton Design Archives
- University of Bristol Special Collections
- University of Bristol Theatre Collection
- University of Central Lancashire Archives and Special Collections
- University of Chichester Special Collections
- University of Dundee Archive Services
- University of East Anglia Archives
- University of East London Archives
- University of Essex Special Collections
- University of Exeter Archives
- University of Glasgow Archive Services
- University of Glasgow Special Collections
- University of Gloucestershire Special Collections and Archives
- University of Kent Special Collections and Archives
- University of Leeds Special Collections
- University of Leicester Special Collections
- University of Liverpool Special Collections & Archives
- University of Manchester Library
- University of Northampton Archive
- University of Nottingham Manuscripts and Special Collections
- University of Portsmouth Archives
- University of Reading Special Collections Services
- University of Roehampton Foyle Special Collections and Archives
- University of Salford Archives & Special Collections
- University of Sheffield Library
- University of Southampton Special Collections
- University of St Andrews Libraries and Museums
- University of Stirling Archives & Special Collections
- University of Strathclyde Archives and Special Collections
- University of Sunderland Special Collections
- University of Surrey Archives and Special Collections
- University of Sussex Special Collections
- University of Wales Trinity Saint David / Prifysgol Cymru Y Drindod Dewi Sant
- University of Worcester Research Collections
- University of the Arts London Archives and Special Collections
- University of the West of Scotland Special Collections
- V&A Archive of Art and Design
- V&A Theatre and Performance Collections
- V&A Wedgwood Collection
- Wadham College Archives, University of Oxford
- Wallace Collection
- Wellcome Collection
- West Dunbartonshire Council Archive Services - Clydebank
- West Dunbartonshire Council Archive Services - Dumbarton
- West Glamorgan Archive Service
- West Linton and District Historical Association
- West Sussex Record Office
- West Yorkshire Archive Service, Bradford
- West Yorkshire Archive Service, Calderdale
- West Yorkshire Archive Service, Kirklees
- West Yorkshire Archive Service, Leeds
- West Yorkshire Archive Service, Wakefield
- Westminster Baptist Church
- Whitby Literary and Philosophical Society Archive
- William Morris Gallery, London Borough of Waltham Forest
- Women's Art Library Collections, Goldsmiths, University of London
- Women's Library Archives
- Working Class Movement Library
- Wrexham Archives and Local Studies
- York St John University Archives and Special Collections
