| Company | Timeline | Status | |
J. Colburn Limited Director • Engineer | 30 Jun 2010←8 Years→17 Jul 2018 | Dissolved | |
| Garthco Limited Director • Company Director | 9 Jan 1992←24 Years→29 Jul 2016 | Active | |
| Garthco Limited Director • Engineer | 9 Jan 1992←6 Months→31 Jul 1992 | Active | |
