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- " Health and Social Care Northern Ireland"
- " NHS Informatics Merseyside"
- 1015 (Horsham) Squadron RAFAC
- 1895 (Cromer) Sqn RAFAC
- 2110 (North Walsham) Sqn RAFAC
- 3Sixty Networks
- ACAS
- Allerdale Borough Council
- Appivate, Royal Air Force
- Ashford and St Peter's Hospital NHS Foundation Trust
- Automated Test 2
- Avon & Somerset Police
- Avon and Wiltshire Mental Health Partnership NHS Trust
- Basingstoke and Deane Borough Council
- Bath and North East Somerset Council
- Bedford Borough Council
- BFSAI Defence Digital MOD
- Black Country Healthcare NHS Foundation Trust
- Black Country ICB
- Blackburn with Darwen Borough Council
- Blackpool Borough Council
- Bolton Metropolitan Borough Council
- Bolton NHS Foundation Trust
- Borough Council of King's Lynn and West Norfolk
- Bournemouth, Christchurch and Poole Council
- Bracknell Forest Council
- Braintree District Council
- Brentwood Borough Council
- Bridgewater Community Healthcare NHS Foundation Trust
- Brighton and Hove City Council
- British Antarctic Survey
- British Council
- British Tourist Authority
- British Transport Police
- Broxtowe Borough Council
- Burnley Borough Council
- Bury Metropolitan Borough Council
- Cabinet Office
- Cambridgeshire Constabulary
- Cambridgeshire County Council
- Cambridgeshire Fire & Rescue Service
- Camden Council
- Cannock Chase District Council
- Care Inspectorate
- Care Quality Commission
- Carterton Community College
- Ceredigion County Council
- Cheltenham Borough Council
- Cherwell District Council
- Chesterfield Royal Hospital NHS Trust
- City of Lincoln Council
- City of Westminster
- City of Wolverhampton Council
- City of York Council
- Civil Service
- Clatterbridge Cancer Centre
- Cleveland Fire Brigade
- Cleveland Police
- College of Policing
- Companies House
- Competition and Markets Authority
- Cornwall Council
- Cornwall IT Services
- Counter Terrorism Policing Headquarters
- Countess Of Chester Hospital NHS Foundation Trust
- 'County Durham and Darlington Fire and Rescue Service '
- Coventry City Council
- Crown Office and Procurator Fiscal Service 
- Crown Prosecution Service
- Cumbria Constabulary
- Dacorum Borough Council
- Defence Equipment and Support
- Defence Science and Technology Laboratory
- Delt Shared Services
- Department for Business, Energy & Industrial Strategy
- Department for Digital, Culture, Media and Sport
- Department for Education
- Department for Environment, Food & Rural Affairs
- Department for International Development
- Department for International Trade
- Department for Transport
- Department for Work and Pensions
- Department of Finance and Personnel for Northern Ireland
- Department of Health and Social Care
- Department of Health, Social Services and Public Safety
- Derby City Council
- Derbyshire Constabulary
- Derbyshire County Council
- Derbyshire Fire & Rescue Service
- Derbyshire Healthcare NHS Foundation Trust
- Devon & Cornwall Police & Dorset Police
- Devon and Somerset Fire and Rescue service
- Devon County Council
- Devon Partnership NHS Trust
- Digital, data and technology professions
- Doncaster Metropolitan Borough Council
- Dorset and Wiltshire Fire and Rescue Service
- Dorset Council
- Dounreay Site Restoration Limited
- Driver and Vehicle Licensing Agency
- Driver and Vehicle Standards Agency
- Dudley Group NHS Foundation Trust
- Dudley Metropolitan Borough Council
- Durham Constabulary
- Durham County Council
- East Ayrshire Council
- East Midlands Ambulance Service NHS Trust
- East Midlands Combined County Authority
- East Suffolk & North Essex NHS Foundation Trust
- East Suffolk Council
- East Sussex County Council
- East Sussex Fire and Rescue Service
- Eastbourne Borough Council
- Eastleigh Borough Council
- Edinburgh International Conference Centre
- Elmbridge Borough Council
- Environment Agency
- Epping Forest District Council
- Epsom and Ewell Borough Council
- Erewash Borough Council
- Essex County Fire and Rescue Service
- Fareham Borough Council
- FCO Services
- Fenland District Council
- Food Standards Agency
- Foreign & Commonwealth Office
- Foreign, Commonwealth & Development Office
- Forest Research
- Forestry and Land Scotland
- Gateshead Metropolitan Borough Council
- Global Defence Network (MoD)
- Gloucester City Council
- Gloucester Police
- Gloucestershire County Council
- Government Actuary's Department
- Government Certified Training (GCT)
- Government Digital Service
- Government Legal Department
- Government Property Agency
- GovWifi Developers
- GovWifi Super Administrators
- GovwifiIcreamFarm
- GPA
- GPA Hubs
- Great British Nuclear
- Great Western Hospitals NHS Foundation Trust
- Greater London Authority
- Greater Manchester Combined Authority
- Greater Manchester Mental Health NHS Foundation Trust
- Guildford Borough Council
- Hampshire & Isle of Wight Fire and Rescue Service
- Hampshire Constabulary
- Hampshire County Council
- Hartlepool Borough Council
- Havant Borough Council
- Health and Safety Executive
- Hereford & Worcester Fire and Rescue Service
- Herefordshire and Worcestershire Clinical Commissioning Group
- Herefordshire and Worcestershire Health and Care NHS Trust
- Herefordshire Council
- Hertfordshire Constabulary/Bedfordshire Police
- Hertfordshire County Council
- High Speed Two (HS2) Limited
- HM Courts & Tribunals Service
- HM Inspectorate of Constabulary and Fire & Rescue Services
- HM Land Registry
- HM Revenue & Customs
- Home Office
- Homes England
- Housing Ombudsman
- hubconnect
- Human Fertilisation and Embryology Authority
- Humber Teaching NHS Foundation Trust
- Huntingdonshire District Council
- i.AI
- ICC Birmingham
- ICC Wales
- Independent Office for Police Conduct
- insolvency.gov.uk
- Inspire
- Intellectual Property Office
- Isle of Wight Council
- Judicial Office
- Kent and Essex Police
- Lancashire County Council
- Lancaster City Council
- Leeds City Council
- Leicester City Council
- Leicestershire County Council
- Leicestershire Fire and Rescue Service
- Lichfield District Council
- Lincolnshire County Council
- Lisburn & Castlereagh City Council
- Liverpool Women’s NHS Foundation Trust
- LLW Repository Ltd
- Local Government and Social Care Ombudsman
- London Borough of Bexley
- London Borough of Brent
- London Borough of Bromley
- London Borough of Hackney
- London Borough of Harrow
- London Borough of Lambeth
- London Borough of Merton
- London Borough of Newham
- London Borough of Redbridge
- London Borough of Tower Hamlets
- London Borough of Waltham Forest
- London Fire Brigade
- London International Exhibition Centre
- Loughborough University
- Luton Borough Council
- Lymington and Pennington Town Council
- Manchester City Council
- Manchester University NHS Foundation Trust
- Manufacturing Technology Centre
- Maritime and Coastguard Agency
- Medical Research Council
- Medicines and Healthcare products Regulatory Agency
- Mersey West Lancs Teaching Hospitals
- Merseyside Fire and Rescue Service
- Met Office
- Metropolitan Police Service - Hendon
- Mid Cheshire Hospitals NHS Foundation Trust
- Mid Devon District Council
- Ministry of Defence
- Ministry of Housing, Communities and Local Government
- Ministry of Justice
- mod
- MoD LEARN
- MoD-PJHQ
- Mole Valley District Council
- NAO
- National Institute for Health and Care Excellence
- National Oceanography Centre
- National Police Chiefs Council
- National Probation Service
- National Probation Service (Supplied by Telappliant)
- Natural Resources Wales
- NatureScot
- Neath Port Talbot Council
- Newcastle City Council
- NHS Arden and Greater East Midlands
- NHS Bath and North East Somerset, Swindon and Wiltshire Integrated Care Board (ICB)
- NHS Cheshire and Merseyside
- NHS Digital
- NHS England
- NHS Greater Manchester Integrated Care
- NHS Hampshire and Isle of Wight ICB
- NHS Humber and North Yorkshire ICB
- NHS Mid and South Essex ICB
- NHS Midlands & Lancashire Commissioning Support Unit (MLCSU)
- NHS South, Central and West Commissioning Support Unit
- NHS University Hospitals of Liverpool Group
- NHS West Yorkshire ICB in Leeds
- Norfolk & Suffolk Constabulary
- Norfolk County Council
- Norfolk Fire and Rescue Service
- North Ayrshire Council
- North Devon District Council
- North Norfolk District Council
- North Northamptonshire Unitary Council
- North of England Commissioning Support (NECS)
- North Sea Transition Authority
- North Somerset  Council
- North Tyneside Council
- North Yorkshire Police
- Northern Devon Healthcare NHS Trust
- Northern Ireland Civil Service
- Northern Ireland Courts & Tribunals Service
- Northumberland County Council
- Northumberland National Park Authority
- Nottingham and Nottinghamshire ICB
- Nottingham City Council
- Nottinghamshire County Council
- Nottinghamshire Fire & Rescue Service
- Nottinghamshire Police
- NS&I
- Nuclear Decommissioning Authority
- Nuclear Restoration Services (NRS)
- Nuclear Waste Services Ltd
- Nuneaton and Bedworth Borough Council
- Ofcom
- Office for National Statistics
- Office for Nuclear Regulation
- Office for Students
- Office of Rail and Road
- Office of the Secretary of State for Wales
- Ofgem
- Ofqual
- Oldham Metropolitan Borough Council
- Oxfordshire County Council
- Peak District National Park Authority
- Pendle Borough Council
- Pennine Care NHS Foundation Trust
- Pension Protection Fund
- Plymouth Hospitals NHS Trust
- Police Digital Service
- Police Service of Northern Ireland
- Portsmouth City Council
- Professional Standards Authority for Health and Social Care
- Public Health England
- RAF Boulmer
- Redditch Borough Council
- Registers of Scotland
- Regulator of Social Housing
- Rochdale Metropolitan Borough Council
- Rochford District Council
- Rother District Council
- Rotherham Metropolitan Borough Council
- Royal Air Force Air Cadets
- Royal Air Force Air Cyberspace Services Centre
- Royal Air Force Rapid Capabilities Office AIX
- Royal Borough of Kensington and Chelsea
- Royal Borough of Kingston upon Thames
- Royal Borough of Windsor and Maidenhead
- Royal Devon and Exeter NHS Foundation Trust
- Royal United Hospitals NHS Foundation Trust
- Royal Welsh College of Music & Drama
- Royal Wolverhampton NHS Trust
- Rugby Borough Council
- Runnymede Borough Council
- Rutland County Council
- Salford City Council
- Salisbury NHS Foundation Trust
- sandwell and west birmingham nhs trust
- Sandwell Metropolitan Borough Council
- Science and Technology Facilities Council
- Scottish Event Campus
- Scottish Government
- Sellafield Ltd
- Serious Fraud Office
- Shared Resource Service (SRS) BGCBC (Blaenau Gwent County Borough Council)
- Shared Resource Service (SRS) GPA (Gwent police)
- Shared Resource Service (SRS) MCC
- Shared Resource Service (SRS) TCBC
- Sheffield City Council
- Shropshire Fire and Rescue Service
- Single Source Regulations Office
- Social Work England
- Solihull Metropolitan Borough Council
- Somerset County Council
- South Ayrshire Council
- South Central Ambulance Service
- South Derbyshire District Council
- South Downs National Park Authority
- South Gloucestershire Council
- South Hams District Council & West Devon Borough Council
- South Somerset District Council
- South Staffordshire Council
- South Wales Police Headquarters
- South West London and St George's Mental Health NHS Trust
- South Western Ambulance Service NHS Foundation Trust
- Southampton City Council
- Spelthorne Borough Council
- St Albans City and District Council
- Staffordshire County Council
- Staffordshire Police
- Stevenage Borough Council
- Stockport Metropolitan Borough Council
- Stockport NHS Foundation Trust
- Stockton-on-Tees Borough Council
- Stoke-on-Trent City Council
- Strata Service Solutions Ltd
- Strathclyde Partnership for Transport (SPT)
- Stroud District Council
- Student Loans Company
- Submarine Delivery Agency
- Sunderland City Council
- Surrey and Sussex Police
- Surrey County Council
- SUSSEX COMMUNITY NHS FOUNDATION TRUST
- Swansea Council
- Swindon Borough Council
- Tameside and Glossop Integrated Care NHS Foundation Trust
- Tameside Metropolitan Borough Council
- Telford & Wrekin Council
- Tendring District Council
- Test Organisation
- Test Valley Borough Council
- Tewkesbury Borough Council
- Thales Group
- Thames Valley Police
- The Children and Family Court Advisory and Support Service
- The Legal Ombudsman
- The Mayor's Office for Policing And Crime
- The National Archives
- The Office for Environmental Protection
- The Parliamentary and Health Service Ombudsman
- Torbay and South Devon NHS Foundation Trust
- Track4Services
- Trafford Metropolitan Borough Council
- Transport for Greater Manchester
- Transport for London (TfL)
- Tyne & Wear NHS Trust
- Tyne and Wear Fire and Rescue Service
- UK Debt Management Office
- UK Hydrographic Office
- UK Research and Innovation
- UK Space Agency
- UKSBS - Shared Business Service
- Undercover Policing Inquiry
- United Lincolnshire Hospitals NHS Trust
- University Hospitals of Derby and Burton NHS Foundation Trust
- University of Nottingham
- Velindre University NHS Trust
- Wakefield Metropolitan District Council
- Wales Audit Office
- Walsall Healthcare NHS Trust
- Walsall Metropolitan Borough Council
- Warrington and Halton Teaching Hospitals NHS Foundation Trust
- Warrington Borough Council
- Warwick District Council
- Warwickshire County Council
- Warwickshire Police
- Wealden District Council
- West Dunbartonshire Council
- West Mercia Police
- West Midlands Combined Authority
- West Midlands Fire Service
- West Northamptonshire Unitary Council
- West Oxfordshire District Council
- West Yorkshire Combined Authority
- Wigan Metropolitan Borough Council
- Wilton Park
- Wiltshire Council
- Wiltshire Health & Care
- Wiltshire Police
- Winchester City Council
- Wirral Borough Council
- Wirral Community Health & Care NHS Trust
- Wirral University Teaching Hospital NHS Foundation Trust
- Woking Borough Council
- Wokingham Borough Council
- Worcestershire Acute Hospitals NHS Trust
- Worcestershire County Council
- Wrightington, Wigan and Leigh Teaching Hospitals NHS Foundation Trust
- Wychavon District Council
- Wye Valley NHS Trust
- XMA