| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Diploma Developments Limited | 00402016 | 04/01/1991 | Dissolved |
| Diploma Estates Ltd | 00084825 | 04/01/1991 | Dissolved |
| Diploma Properties Limited | 01007410 | 04/01/1991 | Dissolved |
| Nortronic Warehousing Limited | 01468796 | 29/12/1991 | Dissolved |
| Rungarden Ltd | 05457347 | 01/11/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| A.G. (ALLOYS) LIMITED | SC147642 | 16/03/1994 | 09/11/2000 | Dissolved |
| Bunhill Investments Ltd | 00256597 | 05/01/1992 | 15/11/2000 | Dissolved |
| Cwmbran Manufacturing Ltd | 00579493 | 01/12/1991 | 06/08/1999 | Dissolved |
| DIMENSION DATA COMMUNICATIONS (SERVICES) UK LIMITED | 01244813 | 24/10/1991 | 21/02/1992 | Dissolved |
| DIPLOMA EUROPE HOLDINGS LIMITED | 01170317 | 04/01/1991 | 15/11/2000 | Silver |
| DIPLOMA HOLDINGS PLC | 00256111 | 22/01/1992 | 10/01/2002 | One Red Flag |
| DIPLOMA PLC | 03899848 | 21/02/2000 | 07/01/2004 | Gold |
| DIPLOMA UK HOLDINGS LIMITED | 02050821 | 27/06/1994 | 15/11/2000 | Bronze |
| Eldersteels Ltd | 01340465 | 09/11/1995 | 09/11/2000 | Dissolved |
| HOWCO QUALITY ALLOYS LIMITED | 00650132 | 21/12/1991 | 09/11/2000 | Not Trading |
| IS-RAYFAST LIMITED | 01408491 | 27/06/1994 | 15/11/2000 | Bronze |
| NEWLANDGLEBE LIMITED | 01117517 | 21/02/1992 | 07/01/2004 | Silver |
| NORWOOD PARTITIONS LIMITED | 00497247 | 31/12/1991 | 15/11/2000 | Insolvent |
| Nortronic Associates Ltd | 01044736 | 29/12/1991 | 13/10/1999 | Dissolved |
| Quantronix Ltd | 02855342 | 29/11/1993 | 17/10/1994 | Dissolved |
| RESTORE ANACHEM LIMITED | 00974301 | 03/04/1992 | 07/11/2000 | Dissolved |
| WATERFRONT DESIGNER BATHROOMS LIMITED | 01016138 | 23/11/1991 | 24/01/2000 | Dissolved |
| WILLIAMSON, CLIFF LIMITED | 00101668 | 21/02/1992 | 07/01/2004 | Silver |