| Company | Timeline | Status | |
| Crummock Consulting Ltd Director • Engineer | 19 Jul 2022←3 Years→Current | Active | |
| Crummock Engineering Ltd Director • Director | 6 Jun 2014←11 Years→Current | Active | |
| R&R Engineering Services (Glasgow) Ltd Director • Director | 8 Mar 2010←8 Years→18 Dec 2018 | Dissolved | |
