| Acas | Jaguar Land Rover |
| Accenture | KPMG |
| Action for Children | L&Q |
| Admiral Group plc | Lambeth Council |
| Amey plc | Leeds Arts University |
| Anglian Water Services | Legal & General Group plc |
| Anglo American | Linkedin |
| Aon plc | Linklaters |
| Assura plc | Lloyds Banking Group |
| Atos | Lloyd's |
| Auto Trader UK | Llywodraeth Cymru / Welsh Government |
| AVIVA | London Borough of Barking and Dagenham |
| Baker McKenzie | London Borough of Havering |
| Bank of England | London Fire Brigade |
| Barclays | London Legacy Development Corporation |
| Baringa Partners | M&G Prudential |
| Barnardo's | Marks & Spencer |
| Birmingham Community Health Care Foundation Trust | Mayer Brown |
| Black Training and Enterprise Group | Mazars |
| Bramwith Consulting | Medicine and Healthcare Regulatory Authority |
| Bridgewater Community Healthcare NHS Foundation Trust | Metropolitan Thames Valley Housing |
| British Airways | MI5 |
| British Army | MI6 |
| British Film Institute (BFI) | Ministry of Defence (MOD) |
| BT | Ministry of Housing Communities and Local Government |
| Cabinet Office (CO) | Ministry of Justice (MOJ) |
| Calderdale Council | Mitcham Belle Coaches |
| Canada Life Limited | Morgan Stanley International |
| Capgemini UK | Mott MacDonald |
| Capsticks Solicitors LLP | National Assembly for Wales |
| Cardiff Council | National Grid |
| Care Quality Commission | National Police Chiefs Council |
| CBRE UK Ltd | Nationwide |
| Centrica PLC | NCA - National Crime Agency |
| Channel 4 | NEL |
| Chartered Institute of Personnel and Development (CIPD) | Network Rail |
| Chartered Insurance Institute | NHS |
| Christie's | NHS Business Services Authority |
| CITI | NHS England |
| Civil Service | NHS Resolution |
| CMS | NHS Salford CCG |
| Competition and Markets Authority (CMA) | NHS North East London Commissioning Support Unit |
| Confederation of British Industry (CBI) | North Staffordshire Combined Healthcare NHS Trust |
| Costain | North West Ambulance Service NHS Trust |
| CPS | Northern Care Alliance NHS ( Salford and Pennine Acute Hospitals) |
| Croner Group Ltd | Northern Ireland Office |
| DEFRA | Norton Rose Fullbright |
| Deloitte | Ofcom |
| Department for Business Energy and Industrial Strategy (BEIS) | Office of National Statistics (ONS) |
| Department for Digital Culture, Media and Sport (DCMS) | Office of the Advocate General for Scotland |
| Department for Education (DfE) | Oil & Gas Authority |
| Department for Exiting the European Union (DExEU) | PageGroup |
| Department for Health and Social Care (DHSC) | Paul J Watson Solicitor |
| Department for International Development (DFID) | Pearson Plc |
| Department for International Trade (DIT) | Peninsula Business Services |
| Department for Transport | Pertemps |
| Department for Work and Pensions (DWP) | Post Office |
| Derbyshire Healthcare NHS Foundation Trust | Public Health England |
| Diageo | PwC |
| Dimensions | RBS |
| DWF Law | Reach South Academy Trust |
| EDF Energy | Riverside |
| Enterprise Rent-A-Car | Rocking Horse Pictures Ltd |
| Environment Agency | Royal Air Force |
| Essentra | Royal Mail |
| European Bank for Reconstruction and Development (EBRD) | Royal Navy |
| Eversheds Sutherland | Royal Society for Public Health |
| EY | RPC |
| FCO Services | Saatchi and Saatchi |
| Financial Conduct Authority | Sainsbury's |
| Financial Ombudsman Service | Santander |
| Financial Reporting Council | Scottish Government |
| Financial Services Compensation Scheme | Shell |
| Food Standards Agency | Shoosmiths |
| Freshfields Bruckhaus Deringer LLP | Sir Robert McAlpine |
| Fujitsu | Sky |
| GLA | Sodexo UK & Ireland |
| Goldman Sachs | St Mungo's |
| Government Internal Audit Agency (GIAA) | St. James’s Place Wealth Management |
| Grant Thornton UK LLP | Standard Life Aberdeen |
| Greater Manchester Health and Social Care Partnership | Teesside University |
| Greene King | Tesco |
| Hachette UK | The Christie NHS Foundation Trust |
| HarperCollins Publishers | The Co-Operative Bank |
| Health & Safety Executive | The House of Commons and Parliamentary Digital Service |
| Health and Research Authority | The North East Ambulance Service NHS Foundation Trust |
| Health Assured Ltd | The Sovini Group |
| Health Education England | The Telegraph |
| HM Land Registry | Tideway |
| HM Revenue and Customs | TSB Bank plc |
| HM Treasury (HMT) | UBS |
| Hogan Lovells | UK Athletics |
| Home Office (HO) | UK Government Investments |
| Horwich Farrelly Solicitors | Unilever UK Ltd |
| House of Lords | University of St Andrews |
| Hoxby | Valuation Office Agency - GOV.UK |
| HSBC UK | Viacom International Media Networks (VIMN) |
| IBM UK Limited | Victim Support |
| Impact Creative Recruitment Ltd | Wellcome Trust |
| Insolvency | Westminster City Council |
| Intellectual Property Office | WPP plc |
| ITN | |
| J.P. Morgan | |
