| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Greenhall Insulation Contracts Ltd | 03583081 | 23/06/1998 | Dissolved |
| Greenhall Insulation Ltd | 05525589 | 28/10/2005 | Dissolved |
| Greenhall Insulation Services Ltd | 02473201 | 09/04/1992 | Dissolved |
| PHENOLIC HAMSTER TUBE SYSTEMS LIMITED | 06350760 | 12/01/2009 | Dissolved |
| PRE-INSULATED SYSTEMS LIMITED | 06761964 | 01/12/2008 | Dissolved |
| SOUND PROTECTION SOLUTIONS LTD | 16022824 | 15/01/2025 | Amber |
| SPECIALIST DUCTWORK SYSTEMS LIMITED | 04442735 | 06/01/2009 | Dissolved |
| SPECIALIST INSULATION LIMITED | 05454509 | 21/06/2005 | Dissolved |
| SPIRALITE DUCTWORK SOLUTIONS LIMITED | 07365260 | 31/12/2011 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| PMP MANUFACTURING LTD | 10922254 | 01/02/2018 | 30/04/2024 | Bronze |
| PRELITE PLENUMS LIMITED | 04885236 | 04/09/2003 | 19/03/2008 | Dissolved |
| SPECIALIST DUCTWORK SYSTEMS LIMITED | 04442735 | 05/06/2002 | 30/04/2004 | Dissolved |
| SPIRALITE HOLDINGS LIMITED | 07362483 | 01/09/2010 | 29/09/2014 | Dissolved |