| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Fire Systems Engineering Limited | 02862520 | 01/05/1994 | Dissolved |
| Inefco Ltd | 02477756 | 01/05/1994 | Dissolved |
| James Robertson and Sons (Fleetwood) Limited | 02694580 | 01/05/1994 | Dissolved |
| KARRITAINERS LIMITED | 04049347 | 08/08/2000 | Dissolved |
| Logical Parts & Services Ltd | 03950986 | 31/03/2000 | Dissolved |
| N G E Environmental Limited | 02682035 | 01/05/1994 | Dissolved |
| PIKROSE LIMITED | 04038775 | 08/08/2000 | Dissolved |
| Substation Services Ltd | 05132859 | 01/06/2004 | Dissolved |
| TRANSFORMER SERVICES LIMITED | 05132910 | 01/06/2004 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CAPSTEAD SYSTEMS LIMITED | 02477763 | 01/05/1994 | 06/04/1995 | Dissolved |
| FERRANTI ENGINEERING LIMITED | 03869588 | 01/11/1999 | 28/04/2017 | Dissolved |
| FERRANTI TAPCHANGERS LIMITED | 03952417 | 31/03/2000 | 28/04/2017 | Silver |
| G. & J. WEIR, LIMITED | 02490830 | 01/05/1994 | 06/04/1995 | Not Trading |
| TWG ENGINEERING (NO.3) LIMITED | 02029377 | 01/05/1994 | 06/04/1995 | Dissolved |
| TWG ENGINEERING (NO.4) LIMITED | 02477771 | 01/05/1994 | 06/04/1995 | Dissolved |
| TWG ENGINEERING (NO.4) LIMITED | 02477771 | 26/02/1992 | 18/06/1999 | Dissolved |
| TWG ENGINEERING (NO.7) LIMITED | 02531890 | 01/05/1994 | 06/04/1995 | Dissolved |
| TWG ENGINEERING (NO.9) LIMITED | 02700147 | 01/05/1994 | 06/04/1995 | Dissolved |
| Twg Engineering (No.6) Ltd | 03129282 | 22/11/1995 | 18/06/1999 | Dissolved |