| Company | Timeline | Status | |
| Inline Risk Solutions Ltd Director • Non-executive Director | 1 Apr 2025←8 Months→Current | Active | |
| Durham Geothermal Limited Director • Director | 2 Oct 2023←9 Months→23 Jul 2024 | Dissolved | |
| Tap Geothermal Limited Director • Tap Chief Executive Officer | 10 Aug 2021←2 Years 8 Months→25 Apr 2024 | Active | |
| Tap Solar Limited Director • Tap Chief Executive Officer | 9 Aug 2021←2 Years 8 Months→25 Apr 2024 | Active | |
| Park Head Leisure Ltd Director • Chief Executive | 27 Jul 2021←2 Years 1 Month→14 Sep 2023 | Active | |
| Weardale Railway Limited Director • Chief Executive Officer | 8 Jan 2020←4 Years→25 Apr 2024 | Active | |
| Tap Trading Limited Director • Ceo | 22 Nov 2016←5 Years→20 Sep 2022 | Active | |
Legatus Consultancy Ltd Director • Director | 17 Mar 2016←9 Months→3 Jan 2017 | Dissolved | |
| David Maddan Associates Limited Director • Consultant | 16 Dec 2015←9 Years→Current | Active | |
| Queen Margaret's School, York Limited Director • Army Officer | 25 Jun 2012←6 Years→7 Jul 2018 | In Administration | |
