| Role | Company | Country | Status | Date Range |
|---|---|---|---|---|
| Officer | JAVA (ML94) LIMITED | 🇬🇧United Kingdom | Active | 28/01/2026 – present |
| Person with significant control | SOS DRAINS LIMITED | 🇬🇧United Kingdom | Active | 26/06/2024 – present |
| Person with significant control | JOHNSTON FUELS LIMITED | 🇬🇧United Kingdom | Active | 26/06/2024 – present |
| Officer | HERNING WIND LIMITED | 🇬🇧United Kingdom | Active | 28/04/2026 – present |
| Officer | SOS DRAINS LIMITED | 🇬🇧United Kingdom | Active | 02/03/2026 – present |
| Person with significant control | DXB PROPERTY LIMITED | 🇬🇧United Kingdom | Active | 26/06/2024 – present |
| Officer | DXB PROPERTY LIMITED | 🇬🇧United Kingdom | Active | 08/01/2026 – present |
| Officer | CIRRUS WIND SERVICES LIMITED | 🇬🇧United Kingdom | Active | 15/05/2026 – present |
| Officer | J. W. JOHNSTON LIMITED | 🇬🇧United Kingdom | Active | 28/01/2026 – 01/02/2018 |
| Person with significant control | J GAS LIMITED | 🇬🇧United Kingdom | Active | 26/06/2024 – present |
| Officer | JOHNSTON FUELS LIMITED | 🇬🇧United Kingdom | Active | 26/01/2026 – present |
| Officer | LIQUID GAS UK LTD | 🇬🇧United Kingdom | Active | 15/05/2026 – present |
15/05/2026
Scotland → United Kingdom
28/01/2026
United Kingdom → Scotland
01/01/2014
appointed