| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| NORTHERN GAS NETWORKS FINANCE PLC | 05575923 | 21/06/2011 | Silver |
| NORTHERN GAS NETWORKS HOLDINGS LIMITED | 05213525 | 21/06/2011 | Silver |
| NORTHERN GAS NETWORKS LIMITED | 05167070 | 21/06/2011 | Silver |
| NORTHERN GAS NETWORKS OPERATIONS LIMITED | 03528783 | 21/06/2011 | Bronze |
| WALES & WEST GAS NETWORKS (HOLDINGS) LIMITED | 05095454 | 10/10/2012 | Silver |
| WALES & WEST GAS NETWORKS (JUNIOR FINANCE) LIMITED | 05149491 | 10/10/2012 | Dissolved |
| WALES & WEST GAS NETWORKS (SENIOR FINANCE) LIMITED | 05149493 | 10/10/2012 | Dissolved |
| WALES & WEST UTILITIES FINANCE PLC | 06766848 | 10/10/2012 | Silver |
| WALES & WEST UTILITIES HOLDINGS LIMITED | 07092596 | 10/10/2012 | Silver |
| WALES & WEST UTILITIES LIMITED | 05046791 | 10/10/2012 | Silver |
| WEST GAS NETWORKS LIMITED | 08151511 | 10/10/2012 | Silver |
| WESTERN GAS NETWORKS LIMITED | 08151473 | 10/10/2012 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|