| Company | Timeline | Status | |
| Lothian Horse Box Hire Ltd Director • Engineer | 18 Sep 2015←6 Years→26 Mar 2022 | Dissolved | |
Alan Robertson Developments Ltd Director • Engineer | 1 Oct 2006←11 Years→3 Oct 2017 | Dissolved | |
| Robertson Bros. Engineering Ltd Director • Engineer | 6 Apr 2002←19 Years→26 Mar 2022 | Active | |
