| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Electrocue Ltd | 01549410 | 07/08/1992 | Dissolved |
| The Association of Business Communicators Ltd | 02606137 | 06/06/1991 | Dissolved |
| The Computing Suppliers Federation Ltd | 01986186 | 20/03/2001 | Dissolved |
| The Videowall Co Ltd | 01469669 | 12/09/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ELECTROSONIC LIMITED | 00794221 | 30/01/1993 | 31/12/2004 | Amber |
| Electrosonic Holdings Ltd | 02017949 | 16/01/2009 | 30/01/2009 | Dissolved |
| HELVAR LIMITED | 01478926 | 27/06/2002 | 31/12/2004 | One Red Flag |
| Helectron Ltd | 03283026 | 18/12/1996 | 11/12/2008 | Dissolved |
| Helvar Lighting Control Ltd | 01329921 | 24/12/1991 | 21/12/1999 | Dissolved |