| Acas | Freesat | Northumbrian Water Limited |
| Accenture | Freshfields Bruckhaus Deringer LLP | Norton Rose Fullbright |
| Action for Children | Fujitsu | Nottinghamshire County Council |
| Admiral Group plc | GILBERT-ASH LIMITED | NS&I |
| Age UK | GLA | O. U. Khandokar |
| Ageas Insurance | Goldman Sachs | Ofcom |
| ALDI Stores Ltd | Government Internal Audit Agency (GIAA) | Office of National Statistics (ONS) |
| Amey plc | Grant Thornton UK LLP | Office of the Advocate General for Scotland |
| Anglian Water Services | Greater Manchester Health and Social Care Partnership | Oil & Gas Authority |
| Anglo American | Greene King | OVO |
| Aon plc | Guardian Media Group | PageGroup |
| Assura plc | gunnercooke llp | Palace for Life Foundation |
| Atalian Servest | Gympass | Paul J Watson Solicitor |
| Atos | Hachette UK | Pearson Plc |
| Auto Trader UK | HarperCollins Publishers | Peninsula Business Services |
| Avanade UK Ltd | Health & Safety Executive | Pension Protection Fund |
| AVIVA | Health and Research Authority | People’s Energy |
| AWE | Health Assured Ltd | Pepsico |
| Bain & Company | Health Education England | Pertemps |
| Baker McKenzie | HEARST UK | Place2Be |
| Bank of England | Heart of Kent Hospice | Post Office |
| Bank of Ireland | High Speed Two Ltd. (HS2) | Public Health England |
| Barclays | HM Land Registry | Publicis Groupe UK |
| Baringa Partners | HM Revenue and Customs | Punter Southall Aspire |
| Barnardo's | HM Treasury (HMT) | PwC |
| Barratt Developments PLC | Hodge Jones & Allen Solicitors | Qwest Services |
| Bauer Media Group UK | Hogan Lovells | RBS |
| BCS Consulting | Home Office (HO) | Reach South Academy Trust |
| BDO LLP | Horwich Farrelly Solicitors | Reed in Partnership |
| Birmingham Community Health Care Foundation Trust | Hotel Chocolat | Reed Wellbeing |
| Black Training and Enterprise Group | House of Commons | Riverside |
| BlackRock | House of Lords | Rocking Horse Pictures Ltd |
| Blake Morgan LLP | Hoxby | Royal Air Force |
| Bourne Leisure | HSBC UK | Royal Borough of Greenwich |
| BPDTS Ltd | Human Tissue Authority | Royal Mail |
| Bramwith Consulting | IBM UK Limited | Royal Navy |
| Brand Advance | ICP NURSERIES LIMITED | Royal Society for Public Health |
| Bridgewater Community Healthcare NHS Foundation Trust | Impact Creative Recruitment Ltd | RPC |
| British Airways | Insolvency | RSM |
| British Army | Intellectual Property Office | Saatchi and Saatchi |
| British Film Institute (BFI) | InterContinental Hotels Group | Sainsbury's |
| BT | Investec plc | Santander |
| Bupa Global & UK | Involved Solutions | Savills |
| Business in the community | Irwin Mitchell | Schroders |
| Cabinet Office (CO) | ITN | Science in Sport PLC |
| Calderdale Council | J.P. Morgan | Scottish Government |
| Canada Life Limited | Jaguar Land Rover | Scriberia |
| Capgemini UK | KPMG | Severn Trent |
| Capital One UK | L&Q | Sheffield United Community Foundation |
| Capsticks Solicitors LLP | Lambeth Council | Shell |
| Cardiff Council | Leeds Arts University | Shoosmiths |
| Care Quality Commission | Leeds Building Society | Sir Robert McAlpine |
| Casual Dining Group | Legal & General Group plc | Sky |
| CBRE UK Ltd | Lincolnshire Co-operative | Slaughter and May |
| Centrica PLC | Linkedin | Sodexo UK & Ireland |
| Channel 4 | Linklaters | Softcat plc |
| Chartered Institute of Personnel and Development (CIPD) | Lloyds Banking Group | Sopra Steria |
| Chartered Insurance Institute | Lloyd's | Sport England |
| Chaucer | Llywodraeth Cymru / Welsh Government | SSCL |
| Christie's | London Borough of Barking and Dagenham | St Mungo's |
| CITI | London Borough of Havering | St. James’s Place Wealth Management |
| City of London Corporation | London Fire Brigade | Standard Life Aberdeen |
| Civil Service | London Legacy Development Corporation | TalkTalk |
| Close Brothers Group | London North Eastern Railway (LNER) | Tate |
| CMS | Loungers PLC | Taylor Bennett Foundation |
| Colas UK | M&G Prudential | Teesside University |
| Community union | M&S Bank | Tesco |
| Compass Group | Man Group plc | Thames Water Utilities Ltd |
| Competition and Markets Authority (CMA) | Marks & Spencer | The Christie NHS Foundation Trust |
| Confederation of British Industry (CBI) | Mayer Brown | The Collective |
| Costain | Mazars | The Co-Operative Bank |
| Coutts | Mc&T send response | THE EDGE PICTURE COMPANY |
| Credit Suisse | MediaCom | The Gate London |
| Croner Group Ltd | Medicine and Healthcare Regulatory Authority | The Gym Group |
| Crown Prosecution Service | Mental Health First Aid England | The House of Commons and Parliamentary Digital Service |
| DEFRA | Mental Health Foundation | The Investment Association |
| Delaware North UK | Mercer | The London Borough of Tower Hamlets |
| Deloitte | Metropolitan Thames Valley Housing | The North East Ambulance Service NHS Foundation Trust |
| Dentsu Aegis Network | MI5 | The Sovini Group |
| Department for Business Energy and Industrial Strategy (BEIS) | MI6 | The Stylist Group Ltd |
| Department for Digital Culture, Media and Sport (DCMS) | Middlesbrough College Group | The Telegraph |
| Department for Education (DfE) | Mindset Mental Health Ltd | The7stars(UK) |
| Department for Exiting the European Union (DExEU) | Ministry of Defence (MOD) | Tideway |
| Department for Health and Social Care (DHSC) | Ministry of Housing Communities and Local Government | TSB Bank plc |
| Department for International Development (DFID) | Ministry of Justice (MOJ) | UBS |
| Department for International Trade (DIT) | M-Integrated Solutions PLC | UK Athletics |
| Department for Transport | Mitcham Belle Coaches | UK Government Investments |
| Department for Work and Pensions (DWP) | Mitie | Unilever UK Ltd |
| Derbyshire Healthcare NHS Foundation Trust | Models 1 | United Culture |
| Deutsche Bank | Morgan Stanley International | University of Huddersfield |
| Diageo | Moto Hospitality Ltd | University of Leeds |
| Dimensions | Mott MacDonald | University of St Andrews |
| Docklands Creative | Nando’s UK and Ireland | University of Warwick |
| Dr Zigs | NatCen Social Research | Unruly |
| DWF Law | National Assembly for Wales | Unum |
| East Midlands Railway | National Grid | Valuation Office Agency - GOV.UK |
| EDF Energy | National Police Chiefs Council | Vaultex UK Ltd |
| Ennismore | Nationwide | ViacomCBS Networks International |
| Enterprise Rent-A-Car | NCA - National Crime Agency | Victim Support |
| Environment Agency | NCHA (Nottingham Community Housing Association) | Virgin Care |
| Essentra | NEL | Virgin Management |
| European Bank for Reconstruction and Development (EBRD) | Nestlé UK & Ireland | Virgin Money UK plc |
| Eversheds Sutherland | Network Rail | Vodafone UK |
| EY | NHS | Watson Farley & Williams |
| F1 recruitment ltd | NHS Business Services Authority | WDH |
| FCO Services | NHS England | Weightmans LLP |
| Federated Hermes – International | NHS Resolution | Wellcome Trust |
| Fidelity International | NHS Salford CCG | Welsh Water |
| FIELD STUDIES COUNCIL (FSC) | NHS Shared Business Services | Westminster City Council |
| Financial Conduct Authority | NHS North East London Commissioning Support Unit | WH Smith PLC |
| Financial Ombudsman Service | North Staffordshire Combined Healthcare NHS Trust | Whistl UK Ltd |
| Financial Reporting Council | North Star | Worldline |
| Financial Services Compensation Scheme | North West Ambulance Service NHS Trust | WPP plc |
| Financial Times | Northern Care Alliance NHS ( Salford and Pennine Acute Hospitals) | YSC Consulting |
| Food Standards Agency | Northern Ireland Office | Zurich Insurance UK |
| Forest Holidays | Northern Trust | |
