- AECOM Design Build Limited
- Amec Group Limited
- Arriva Buses
- Balfour Beatty Services
- British Energy Generation Limited
- British Rail
- Bucher Municipal Limited
- Cemex Building Products
- Conamar Building Services Limited
- Devon County Council
- EDF Energy
- Elliott Group UK
- Hanson Group
- Interserve Construction Limited
- Keltruck Limited
- M J S Express Limited
- M.O.D
- M W H Treatment Limited
- Mobile Mini UK Limited
- RMLS Limited
- Speedwell Honda
- Spirax Sarco Limited
- W G Davies (Landore) Limited
- Waco UK Limited
- Walker Construction (UK) Limited
- Water Authorities
- Walter Tipper Limited
- Wernick Construction Limited