| Role | Company | Country | Status | Date Range |
|---|---|---|---|---|
| Officer | NATIONAL ENERGY SYSTEM OPERATOR LIMITED | 🇬🇧Regno Unito | Active | 19/04/2026 – 01/04/2019 |
| Officer | NATIONAL GRID VENTURES LIMITED | — | Active | 19/05/2026 – 13/11/2019 |
| Officer | CADENT GAS LIMITED | 🇬🇧Regno Unito | Active | 28/04/2026 – 08/09/2016 |
| Officer | CADENT SERVICES LIMITED | 🇬🇧Regno Unito | Active | 28/04/2026 – 08/09/2016 |
| Officer | NATIONAL GRID PARTNERS LIMITED | — | Active | 01/05/2026 – 02/07/2018 |
| Officer | NATIONAL GRID VIKING LINK LIMITED | — | Active | 10/05/2026 – 24/06/2014 |
| Officer | NATIONAL GRID WILLIAM LIMITED | — | Active | 26/05/2026 – 04/11/2014 |
| Officer | NG NOMINEES LIMITED | 🇬🇧Regno Unito | Liquidation | 01/01/2026 – 13/11/2019 |
| Officer | NATIONAL GRID BLUE POWER FINANCE LIMITED | — | Dissolved | 07/06/2026 – present |
| Officer | NGC EMPLOYEE SHARES TRUSTEE LIMITED | 🇬🇧Regno Unito | Liquidation | 17/12/2025 – 13/11/2019 |
| Officer | PORTERS END CONSULTANCY LTD | — | Dissolved | 17/05/2026 – present |
13/11/2019
resigned
01/04/2019
resigned
07/11/2012
appointed