| Company | Timeline | Status | |
| Leander Architectural Ltd Director • Unreported | 15 Jul 2022←3 Years→Current | Active | |
| Middlepeak Engineering Limited Director • Unreported | 20 Jul 2001←24 Years→Current | Active | |
| Middlepeak Railways Limited Director • Unreported | 15 May 2001←24 Years→Current | Active | |
| North London Railway Company Ltd Director • Design Engineer | 29 Oct 1999←1 Year 5 Months→2 Apr 2001 | Active | |
| Great Northern Railway Company Ltd Director • Design & Test Engineer | 22 Oct 1999←1 Year→6 Nov 2000 | Active | |
| Kerr, Stuart & Company Ltd Director • Engineer | 29 Dec 1998←14 Years→2 Aug 2013 | Active | |
| W.G. Bagnall Ltd Director • Engineer | 1 Dec 1998←22 Years→26 Jan 2021 | Dissolved | |
