| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BETA CENTRAL PROFITS LIMITED | 06297913 | 29/06/2007 | 24/01/2013 | Gold |
| EASTERN POWER NETWORKS PLC | 02366906 | 24/11/2010 | 08/02/2013 | Bronze |
| ELECTRICITY FIRST LIMITED | 07233880 | 10/06/2010 | 24/01/2013 | Silver |
| Hutchison I D H Development Ltd | 03087718 | 01/09/1995 | 01/02/1997 | Dissolved |
| Hutchison I D H Ltd | 02986130 | 01/03/1995 | 01/02/1997 | Dissolved |
| LONDON POWER NETWORKS PLC | 03929195 | 24/11/2010 | 08/02/2013 | Silver |
| NORTHERN GAS NETWORKS FINANCE PLC | 05575923 | 14/11/2005 | 08/02/2013 | Silver |
| NORTHERN GAS NETWORKS HOLDINGS LIMITED | 05213525 | 17/12/2004 | 08/02/2013 | Silver |
| NORTHERN GAS NETWORKS LIMITED | 05167070 | 31/05/2005 | 08/02/2013 | Silver |
| SOUTH EASTERN POWER NETWORKS PLC | 03043097 | 24/11/2010 | 08/02/2013 | Silver |
| UK POWER NETWORKS HOLDINGS LIMITED | 07290590 | 24/11/2010 | 08/02/2013 | Bronze |
| UK POWER NETWORKS SERVICES HOLDINGS LIMITED | 07306419 | 24/11/2010 | 08/02/2013 | Silver |