| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CRT CONSULTING LIMITED | 07872962 | 06/12/2011 | Gold |
| Crt Management Ltd | 06866497 | 01/04/2009 | Dissolved |
| Envision Energy Ltd | 04513181 | 01/09/2009 | Dissolved |
| GEORGE S HALL WOODCOTE LIMITED | 04241009 | 23/07/2001 | Dissolved |
| George S Hall Hanover Ltd | 04241007 | 23/07/2001 | Dissolved |
| George S Hall London Ltd | 04154827 | 08/03/2001 | Dissolved |
| George S Hall Northern Ltd | 04168330 | 08/03/2001 | Dissolved |
| George S Hall Projects Ltd | 04207729 | 23/07/2001 | Dissolved |
| George S Hall Southern Ltd | 04154826 | 08/03/2001 | Dissolved |
| George S Hall Streamline Ltd | 04168331 | 08/03/2001 | Dissolved |
| George S Hall Wales Ltd | 04241010 | 25/07/2001 | Dissolved |
| OPTIMUM E-SWITCH LIMITED | 08398000 | 11/02/2013 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AMHUINNSUIDHE CASTLE ESTATE LIMITED | 04699408 | 21/07/2003 | 08/03/2007 | Dissolved |
| ASHDOWN CONTROL SERVICES LIMITED | 02351171 | 01/09/2009 | 01/08/2011 | Dissolved |
| BESTACE LIMITED | 03400910 | 01/04/2013 | 06/05/2021 | Dissolved |
| DELTA ENVIRONMENTAL SERVICES LIMITED | 02477045 | 23/03/2007 | 03/10/2008 | Dissolved |
| EVOLVE ENERGY LTD | 05831752 | 01/09/2009 | 01/08/2011 | Dissolved |
| EVOLVE FACILITY SERVICES LIMITED | 07101080 | 04/10/2012 | 13/03/2015 | Silver |
| GEORGE S HALL AMERICAS LIMITED | 01553155 | 01/08/1997 | 03/10/2008 | Amber |
| GEORGE S HALL TRUSTEES LIMITED | 04484700 | 29/08/2002 | 03/10/2008 | Dissolved |
| ISS TECHNICAL SERVICES BUILDING FABRIC LIMITED | 03713355 | 09/02/2006 | 03/10/2008 | Insolvent |
| ISS TECHNICAL SERVICES CENTRAL LIMITED | 00881918 | 20/02/1992 | 03/10/2008 | Insolvent |
| ISS TECHNICAL SERVICES HOLDINGS LIMITED | 00358239 | 28/03/2002 | 03/10/2008 | Not Trading |
| ISS TECHNICAL SERVICES LIMITED | 03162289 | 18/11/1996 | 03/10/2008 | Not Trading |
| ISS TECHNICAL SERVICES NI LIMITED | NI040937 | 05/06/2001 | 06/01/2009 | Insolvent |
| ISS TECHNICAL SERVICES REGIONS LIMITED | 04154822 | 08/03/2001 | 03/10/2008 | Insolvent |
| ISS TECHNICAL SERVICES UK LIMITED | 04207721 | 23/07/2001 | 03/10/2008 | Not Trading |
| ISS TECHNICAL SOLUTIONS LIMITED | 04130880 | 08/03/2001 | 03/10/2008 | Not Trading |
| NOBBS & JONES LIMITED | 01035616 | 01/09/2009 | 01/08/2011 | Dissolved |
| PRICE STREET 2 LIMITED | 04154819 | 08/03/2001 | 03/10/2008 | Dissolved |
| PRICE STREET 5 LIMITED | 04171397 | 08/03/2001 | 03/10/2008 | Dissolved |
| Price Street 1 Ltd | 04177076 | 23/07/2001 | 03/10/2008 | Dissolved |
| Price Street 3 Ltd | 04264332 | 22/07/2002 | 03/10/2008 | Dissolved |
| SALFORD FOUNDATION LIMITED | 02472369 | 30/04/2020 | 02/03/2023 | Gold |
| TARBERT TECHNOLOGIES LIMITED | 04154821 | 08/03/2001 | 29/04/2005 | Dissolved |
| THERMAL CARE SCOTLAND LTD | SC477002 | 07/05/2014 | 03/08/2020 | Bronze |
| THERMATIC BUILDING SERVICES LIMITED | 03421312 | 01/04/2013 | 27/06/2024 | Amber |
| THERMATIC DRAINAGE LIMITED | 06880500 | 31/07/2023 | 27/06/2024 | Silver |
| THERMATIC ENERGY SERVICES LIMITED | 05345641 | 16/09/2015 | 27/06/2024 | Bronze |
| THERMATIC LIMITED | 07110338 | 01/04/2013 | 27/06/2024 | Bronze |
| THERMATIC MAINTENANCE LIMITED | 10427665 | 23/03/2020 | 27/06/2024 | Not Trading |
| THERMATIC SCOTLAND LIMITED | SC551057 | 23/03/2020 | 27/06/2024 | Not Trading |
| THERMATIC TECHNICAL FM LIMITED | 10650952 | 01/04/2017 | 27/06/2024 | Bronze |
| VTV SOLUTIONS LIMITED | 06191460 | 25/10/2021 | 27/06/2024 | Bronze |