| Company | Timeline | Status | |
| Cylindrical Excavations Limited Director • Director | 15 Feb 2017←8 Years→Current | Active | |
J A Robertson Engineering Limited Director • Company Secretary | 16 Apr 2008←6 Years→2 Jan 2015 | Dissolved | |
J A Robertson Engineering Limited Secretary • Unreported | 16 Apr 2008←6 Years→2 Jan 2015 | Dissolved | |
