| Company | Timeline | Status | |
| Charlesworth Electronics Ltd Director • Electronics Engineer | 1 Oct 2020←1 Year 11 Months→13 Sep 2022 | Dissolved | |
Ikon Audio Limited Director • Electronics Engineer | 14 Aug 1995←21 Years→11 Aug 2016 | Dissolved | |
| Zetechtics Limited Director • Electronics Engineer | 1 May 1993←2 Years 6 Months→2 Nov 1995 | Active | |
