| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BERAN INSTRUMENTS LIMITED | 01802762 | 29/12/1991 | Amber |
| CONDITION MONITORING TECHNOLOGY GROUP HOLDINGS LIMITED | 13663325 | 02/02/2022 | Gold |
| CONDITION MONITORING TECHNOLOGY GROUP LIMITED | 05794029 | 25/04/2006 | One Red Flag |
| DJB INSTRUMENTS (UK) LIMITED | 13527905 | 23/07/2021 | Amber |
| HELITUNE LIMITED | 03979088 | 28/04/2000 | Amber |
| PRLMC LIMITED | 09240968 | 08/12/2017 | Gold |
| PROSIG LIMITED | 09099121 | 24/06/2014 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| EMC NETWORK (SW) LIMITED | 03168918 | 07/03/1996 | 01/12/2000 | Dissolved |
| GROUP TRAINING AND DEVELOPMENT LIMITED | 02161616 | 23/11/1992 | 13/01/1999 | Silver |
| NORTH DEVON + | 06238026 | 04/05/2007 | 31/03/2009 | Silver |
| PRODUCT ASSESSMENT AND RELIABILITY CENTRE LIMITED | 03844095 | 11/10/1999 | 19/07/2017 | Gold |