| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CENTRAL NETWORKS TRUSTEES LIMITED | 07561556 | 01/09/2013 | 09/02/2015 | Not Trading |
| INFRALEC 1992 PENSION TRUSTEE LIMITED | 02749536 | 01/09/2013 | 09/02/2015 | Dissolved |
| NATIONAL GRID ELECTRICITY DISTRIBUTION (EAST MIDLANDS) PLC | 02366923 | 01/09/2013 | 09/02/2015 | Silver |
| NATIONAL GRID ELECTRICITY DISTRIBUTION (SOUTH WALES) PLC | 02366985 | 01/09/2013 | 09/02/2015 | Bronze |
| NATIONAL GRID ELECTRICITY DISTRIBUTION (SOUTH WEST) PLC | 02366894 | 01/09/2013 | 09/02/2015 | Silver |
| NATIONAL GRID ELECTRICITY DISTRIBUTION (WEST MIDLANDS) PLC | 03600574 | 01/09/2013 | 09/02/2015 | Silver |
| NATIONAL GRID ELECTRICITY DISTRIBUTION INVESTMENTS LIMITED | 02202625 | 01/09/2013 | 09/02/2015 | Silver |
| NATIONAL GRID ELECTRICITY DISTRIBUTION MIDLANDS LIMITED | 02366928 | 01/09/2013 | 09/02/2015 | Silver |
| NATIONAL GRID ELECTRICITY DISTRIBUTION NETWORK HOLDINGS LIMITED | 08857746 | 24/01/2014 | 09/02/2015 | Bronze |
| NATIONAL GRID ELECTRICITY DISTRIBUTION PLC | 09223384 | 16/10/2014 | 09/02/2015 | Bronze |
| NATIONAL GRID HELICOPTERS LIMITED | 02439215 | 01/03/2005 | 09/02/2015 | Gold |
| NATIONAL GRID TELECOMS LIMITED | 02386327 | 31/10/2007 | 31/08/2013 | Silver |
| PPL UK DISTRIBUTION HOLDINGS LIMITED | 04267536 | 01/09/2013 | 09/02/2015 | Dissolved |
| STARK CONNECT LIMITED | 07139151 | 28/01/2010 | 09/02/2015 | Bronze |
| WESTERN POWER PENSION TRUSTEE LIMITED | 02813866 | 01/09/2013 | 09/02/2015 | Not Trading |
| WPD INVESTMENTS LIMITED | 03055273 | 01/09/2013 | 09/02/2015 | Dissolved |
| WPD MIDLANDS NETWORKS CONTRACTING LIMITED | 02710658 | 01/09/2013 | 09/02/2015 | Dissolved |
| WPD MIDLANDS PROPERTIES LIMITED | 03600545 | 01/09/2013 | 09/02/2015 | Dissolved |
| WPD WEM LIMITED | 04066211 | 01/09/2013 | 09/02/2015 | Silver |