| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| C K s Drilling Fluids (U K) Ltd | 01856191 | 01/02/1991 | Dissolved |
| Centrilift Ltd | 01723224 | 16/03/1992 | Dissolved |
| Diamond Oil Well Drilling Co (U K) Ltd | SC085886 | 13/06/1989 | Dissolved |
| Eastman Christensen Ltd | 01793912 | 01/02/1992 | Dissolved |
| Eden Engineering Ltd | 01024037 | 01/01/1993 | Dissolved |
| Exploration Logging (Services) Ltd | 01217419 | 01/02/1992 | Dissolved |
| Exploration Logging (U K) Ltd | SC040447 | 13/02/1990 | Dissolved |
| Mesulect Ltd | 01094389 | 01/02/1992 | Dissolved |
| Seaco Sales & Services (North Sea) Ltd | SC065727 | 13/06/1989 | Insolvent |
| Strathdon Chemicals Ltd | SC071832 | 20/10/1989 | Insolvent |
| Technical Chemical Manufacturing Co Ltd | 01127103 | 01/02/1991 | Dissolved |
| Teleco Magna Ltd | 01404158 | 16/07/1992 | Dissolved |
| Teleco Oilfield Services (Europe) Ltd | SC039814 | 25/05/1992 | Dissolved |
| Teleco Well Navigation Limited | 01688839 | 16/07/1992 | Dissolved |
| Westronics Europe Ltd | 02022472 | 01/02/1992 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Autocare (U K) Ltd | 02567702 | 11/12/1991 | 11/12/1992 | Dissolved |
| TETRA TECHNOLOGIES U.K. LIMITED | 01774672 | 01/02/1991 | 30/03/1992 | Gold |
| TUBOSCOPE VETCO (U.K.) LIMITED | SC107988 | 15/05/1989 | 29/10/1991 | Dissolved |