| Service |
| Anglia OH |
| Ascenti Health |
| Ashlands Occupational Health Ltd |
| Assured Occupational Health |
| Barking Havering & Redbridge Hospitals NHS Trust |
| Barts Health NHS Trust |
| Bedford Occupational Health and Well Being Centre |
| Betsi Cadwaladr University Health Board Occupational Health & Wellbeing |
| Black and Banton Occupational and Physical Health Services |
| Blackpool Council Occupational Health Service |
| BMI Healthcare Ltd |
| Buckinghamshire Healthcare NHS Trust |
| Carmarthenshire County Council |
| Choose Occupational Health |
| Company Health Services Ltd |
| Corazon Health Ltd |
| Cornwall Council |
| Corporate Health Ireland |
| County Durham and Darlington NHS Foundation Trust |
| Croydon University Hospital |