| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| DIDCOT HEAT TREATMENT LIMITED | 01845717 | 18/11/1998 | Dissolved |
| DIDCOT HEAT TREATMENT LIMITED | 01845717 | 30/06/2002 | Dissolved |
| Offshore Pipeline Services Ltd | 02400480 | 03/07/1991 | Dissolved |
| Pipetex Ltd | 02095241 | 18/12/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| P I H HOLDINGS LIMITED | 03335609 | 11/11/1998 | 11/03/2011 | Amber |
| P I H HOLDINGS LIMITED | 03335609 | 24/10/2003 | 11/03/2011 | Amber |
| PIH KAZAKHSTAN LIMITED | 04036329 | 28/03/2001 | 17/05/2011 | Dissolved |
| PIH SERVICES LIMITED | 03814515 | 30/07/1999 | 17/05/2011 | One Red Flag |
| PIPELINE INDUCTION HEAT LIMITED | 01478556 | 19/03/1992 | 11/03/2011 | One Red Flag |
| UNIVERSAL INSPECTION SYSTEMS LIMITED | SC125587 | 06/10/2006 | 04/04/2011 | Dissolved |