| Company | Timeline | Status | |
| Baker Mackay Whittle Limited Director • Engineer | 14 Sep 2022←3 Years→Current | Active | |
| Curtis Assemble And Test Limited Director • Engineer | 1 Jul 2001←24 Years→Current | Active | |
| Curtis Assemble And Test Limited Secretary • Engineer | 1 Jul 2001←24 Years→Current | Active | |
| Curtis Machine Tools Limited Secretary • Engineer | 1 Jul 2001←22 Years→7 Jul 2023 | Active | |
| Douglas Curtis Machine Tools (Colchester) Limited Director • Engineer | 10 Nov 1991←33 Years→Current | Active | |
