| Role | Company | Country | Status | Date Range |
|---|---|---|---|---|
| Person with significant control | THE HEATHERSLAW LIGHT RAILWAY CO LTD | 🇬🇧Regno Unito | Active | 18/06/2024 – present |
| Person with significant control | TETRAGEN HOLDINGS LIMITED | 🇬🇧Regno Unito | Active | 19/06/2024 – present |
| Person with significant control | TETRAGEN (KNAPTON) (UK) LTD | 🇬🇧Regno Unito | Active | 22/06/2024 – 28/04/2017 |
| Person with significant control | GREEN ENGINE LIMITED | 🇬🇧Regno Unito | Active | 24/06/2024 – present |
| Person with significant control | DARRELL SMITH LIMITED | 🇬🇧Regno Unito | Active | 24/06/2024 – present |
| Officer | CLEAN VORTEX LIMITED | 🇬🇧Regno Unito | Dissolved | 04/05/2026 – 26/08/2016 |
| Officer | GREEN ENGINE LIMITED | 🇬🇧Regno Unito | Active | 03/02/2026 – present |
| Officer | TETRAGEN (KNAPTON) (UK) LTD | 🇬🇧Regno Unito | Active | 11/12/2025 – present |
| Officer | TETRAGEN (KNAPTON) LTD | 🇬🇧Regno Unito | Dissolved | 08/05/2026 – present |
| Officer | YORKSHIRE PELLET SUPPLIES LIMITED | — | Dissolved | 16/05/2026 – present |
| Officer | DARRELL SMITH LIMITED | 🇬🇧Regno Unito | Active | 09/03/2026 – present |
| Officer | TETRAGEN HOLDINGS LIMITED | 🇬🇧Regno Unito | Active | 10/02/2026 – present |
| Officer | ADVISERS4U LIMITED | — | Dissolved | 24/05/2026 – 30/01/2017 |
| Officer | CLEANSIX LIMITED | — | Dissolved | 25/05/2026 – 27/06/2013 |
| Officer | CLEANSIX LIMITED | — | Dissolved | 25/05/2026 – 17/10/2012 |
| Officer | TETRAGEN LIMITED | 🇬🇧Regno Unito | Dissolved | 26/05/2026 – present |
| Officer | THE HEATHERSLAW LIGHT RAILWAY CO LTD | 🇬🇧Regno Unito | Active | 26/05/2026 – present |
26/05/2026
England → United Kingdom
20/05/2026
United Kingdom → England
26/08/2010
appointed