| Service |
| Advanced Occupational Health Medicals Ltd |
| Airedale NHS Foundation Trust |
| ARC Academy UK LTD |
| Armed Forces Defence Primary Health Care |
| Ascenti Health |
| Ashlands Occupational Health Ltd |
| Assured Occupational Health |
| Aston Martin |
| Avondale Construction |
| Ayrshire Medical Services Ltd |
| Babcock International Group |
| Back in Action UK |
| Barts Health NHS Trust |
| Bedford Occupational Health and Well Being Centre |
| Bell Work Health Ltd |
| Black and Banton Occupational and Physical Health Services |
| Blackpool Council Occupational Health Service |
| BMI Healthcare Ltd |
| British Gypsum |
| Building Health Ltd |