| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| A V O Technical Services Ltd | 02390707 | 01/04/1997 | Dissolved |
| A V O Technical Services Ltd | 02390707 | 01/04/1997 | Dissolved |
| H. W. Sullivan Ltd | 00185364 | 01/04/1997 | Dissolved |
| H. W. Sullivan Ltd | 00185364 | 01/04/1997 | Dissolved |
| Measurement Ltd | 02127415 | 01/04/1997 | Dissolved |
| Measurement Ltd | 02127415 | 01/04/1997 | Dissolved |
| Megger Instruments Ltd | 00663631 | 01/04/1997 | Dissolved |
| Megger Instruments Ltd | 00663631 | 01/04/1997 | Dissolved |
| Record Electrical Co Ltd | 00172920 | 01/04/1997 | Dissolved |
| Record Electrical Co Ltd | 00172920 | 01/04/1997 | Dissolved |
| Taylor Electrical Instruments Ltd | 00348738 | 01/04/1997 | Dissolved |
| Taylor Electrical Instruments Ltd | 00348738 | 01/04/1997 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| MEGGER GROUP LIMITED | 02582519 | 01/04/1997 | 20/01/2015 | Gold |
| MEGGER INSTRUMENTS LIMITED | 00190137 | 01/04/1997 | 07/05/2004 | Gold |
| MEGGER LIMITED | 02110613 | 01/04/1997 | 30/04/2010 | Silver |
| RELAY ENGINEERING SERVICES LIMITED | 02142282 | 09/03/2012 | 16/05/2014 | Strike Off |
| SEBA KMT UK LIMITED | 04593899 | 10/08/2012 | 04/04/2014 | Dissolved |
| STRIX (U.K.) LIMITED | 02570237 | 01/12/1993 | 31/08/1996 | Amber |
| STRIX (U.K.) LIMITED | 02570237 | 30/12/1994 | 31/08/1996 | Amber |
| Yorkshire Precision Tooling Ltd | 01052125 | 12/07/1991 | 28/06/1996 | Dissolved |
| Yorkshire Precision Tooling Ltd | 01052125 | 08/02/1995 | 28/06/1996 | Dissolved |