| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Clarkson Lord & Co Ltd | 00939656 | 22/01/1991 | Dissolved |
| Clarkson,A,& Co Ltd | 00959980 | 22/01/1991 | Dissolved |
| Elks,D C,& Son Ltd | 00928160 | 22/01/1991 | Dissolved |
| Lewis Instruments Ltd | 01320071 | 22/01/1991 | Dissolved |
| Site Instruments (Newcastle) Ltd | 01132074 | 17/01/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Bramall (Laser Hire) Ltd | 01368614 | 17/01/1991 | 22/05/1992 | Dissolved |
| Ellar Data Services Ltd | 02055463 | 21/01/1991 | 22/05/1992 | Dissolved |
| HALL & WATTS LTD | 01236664 | 22/01/1992 | 22/05/1992 | Dissolved |
| HALL & WATTS PROPERTIES LIMITED | 01922899 | 22/01/1991 | 22/05/1992 | Strike Off |
| Hall & Watts (Defence Sales) Ltd | 02062420 | 05/02/1991 | 22/05/1992 | Dissolved |
| Hall & Watts (London) Ltd | 00149097 | 22/01/1992 | 22/05/1992 | Dissolved |
| Hall & Watts (Management Services), Ltd | 01283098 | 21/01/1991 | 22/05/1992 | Dissolved |
| MCCARTHY TAYLOR SYSTEMS LIMITED | 02339960 | 21/01/1991 | 22/05/1992 | Silver |
| Watts Instruments Ltd | 00351120 | 22/01/1991 | 22/05/1992 | Dissolved |