| Company | Timeline | Status | |
| Mawby Mechanical Design Limited Director • Director | 17 May 2016←8 Years→22 Apr 2025 | Dissolved | |
Calder Design Limited Director • Chartered Engineer | 21 Nov 2006←11 Years→21 Nov 2017 | Dissolved | |
| Blackdyke Engineers Limited Director • Chartered Engineer | 15 Dec 2005←11 Months→1 Dec 2006 | Active | |
| Blackdyke Engineers Limited Director • Chartered Engineer | 11 May 2005←2 Months→11 Jul 2005 | Active | |
| Lawson Engineers Limited Director • Chartered Engineer | 20 May 2004←2 Years 6 Months→1 Dec 2006 | Active | |
