| Service |
| Anglia OH |
| Ascenti Health |
| Ashlands Occupational Health Ltd |
| Assured Occupational Health |
| Ayrshire Medical Services Ltd |
| Barking Havering & Redbridge Hospitals NHS Trust |
| Bedford Occupational Health and Well Being Centre |
| Black and Banton Occupational and Physical Health Services |
| Blackpool Council Occupational Health Service |
| Buckinghamshire Healthcare NHS Trust |
| Choose Occupational Health |
| Co-Health |
| Company Health Services Ltd |
| ContourMC Ltd Occupational Health |
| Corazon Health Ltd |
| County Durham and Darlington NHS Foundation Trust |
| Croydon University Hospital |
| DCHC |
| Dorset Healthcare University Foundation Trust |
| DPHC - ROHT Portsmouth |