| Company | Timeline | Status | |
| David Booth Consultancy Limited Director • Engineer | 21 Oct 2005←20 Years→Current | Active | |
| David Booth Consultancy Limited Secretary • Engineer | 21 Oct 2005←20 Years→Current | Active | |
| Consultus International UK (THE Energy Brokers) Limited Director • Consulting Engineer | 6 Sep 1994←21 Years→13 Oct 2015 | Active | |
