| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| W B B Hydro Ltd | 02485640 | 31/01/1998 | Dissolved |
| W.B.B. Trustees Limited | 01421202 | 22/09/2000 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| SIBELCO MINERALS AND CHEMICALS (HOLDINGS) LIMITED | 00495403 | 17/07/2000 | 11/07/2002 | Bronze |
| SIBELCO UK LIMITED | 00578631 | 17/07/2000 | 11/07/2002 | Bronze |
| THE KAOLIN AND BALL CLAY ASSOCIATION (UK) | 00366883 | 13/05/1998 | 16/05/2001 | Not Trading |
| WATTS BLAKE BEARNE AND COMPANY LIMITED | 00133468 | 01/05/1995 | 11/07/2002 | Silver |
| WBB DEVON CLAYS LIMITED | 02394306 | 29/11/1995 | 11/07/2002 | Dissolved |
| WBB MINERALS (HOLDINGS) LIMITED | 02169028 | 31/01/1999 | 11/07/2002 | Dissolved |
| WBB TECHNOLOGY LIMITED | 01329637 | 31/01/1998 | 01/10/2001 | Dissolved |