| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Leasequick Ltd | 02712215 | 29/05/1992 | Dissolved |
| Psb (Newmarket) Services Ltd | 02759743 | 14/12/2005 | Dissolved |
| Psb Lighter Than Air Ltd | 05063474 | 05/03/2004 | Dissolved |
| Psb Realty Ltd | 02264265 | 29/11/1991 | Dissolved |
| Qualisound Limited | 02608156 | 28/08/1991 | Dissolved |
| Qualitair Aviation Group Ltd | 02477610 | 26/04/1991 | Dissolved |
| Qualitair Developments Ltd | 01724421 | 26/04/1991 | Dissolved |
| Qualitair Information Services Ltd | 02477613 | 26/04/1991 | Dissolved |
| Qualitair Racing Ltd | 02345322 | 23/07/1991 | Dissolved |
| Qualitair School of Air Maintenance Ltd | 02640065 | 28/08/1991 | Dissolved |
| Qualitair Training Services Ltd | 02477615 | 26/04/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| NETCEED UK LIMITED | 01349036 | 22/02/1992 | 14/05/1993 | Silver |
| QUALITAIR AVIATION GROUP LIMITED | 02660605 | 19/03/2002 | 31/12/2007 | One Red Flag |
| QUALITAIR AVIATION SERVICES LIMITED | 02115309 | 01/02/1993 | 14/03/1994 | One Red Flag |
| QUALITAIR AVIATION SERVICES LIMITED | 02115309 | 16/05/1992 | 31/12/2007 | One Red Flag |