| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| DS WIND ENERGY LIMITED | 08574844 | 18/06/2013 | Gold |
| Retrotec (Europe) Ltd | 02768214 | 17/08/2005 | Dissolved |
| SRM CONTRACTING LIMITED | 05586460 | 07/10/2005 | Dissolved |
| SRM CONTRACTING LIMITED | 05586460 | 24/07/2006 | Dissolved |
| SRM ENERGY GROUP LIMITED | 08945557 | 21/05/2014 | Gold |
| SRM ENERGY HOLDINGS LIMITED | 07765920 | 29/09/2014 | Bronze |
| SRM ENERGY LIMITED | 05806753 | 05/05/2006 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| EVOLUTION TECHNICAL SERVICES (GROUP) LIMITED | 07530089 | 24/03/2011 | 11/11/2019 | Bronze |
| STROMA BUILT ENVIRONMENT LIMITED | 04507219 | 28/10/2005 | 01/10/2012 | Silver |
| STROMA BUILT ENVIRONMENT LIMITED | 04507219 | 07/02/2005 | 23/05/2014 | Silver |
| STROMA CERTIFICATION LIMITED | 06429016 | 16/11/2007 | 07/11/2011 | Gold |
| STROMA DEVELOPMENTS LIMITED | 05256474 | 12/10/2004 | 01/10/2012 | One Red Flag |
| STROMA DEVELOPMENTS LIMITED | 05256474 | 12/10/2004 | 23/05/2014 | One Red Flag |
| STROMA HOLDINGS LIMITED | 08945555 | 21/05/2014 | 23/05/2014 | Silver |