| Service |
| Ad Hoc Occupational Health Limited |
| Anglia OH |
| Ascenti Health |
| Asclepius OHS Ltd |
| Ashlands Occupational Health Ltd |
| Assured Occupational Health |
| Ayrshire Medical Services Ltd |
| Back in Action UK |
| 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 |
| Bolton NHS Foundation Trust Occupational Health Service |
| Buckinghamshire Healthcare NHS Trust |
| Choose Occupational Health |
| Co-Health |
| ContourMC Ltd Occupational Health |
| County Durham and Darlington NHS Foundation Trust |
| DCHC |
| DPHC - ROHT Portsmouth |