| Company | Timeline | Status | |
| Callow Process Systems Limited Director • Engineer | 30 Apr 2013←12 Years→Current | Active | |
| William Birch (Machinery) Ltd Director • Engineer | 30 Apr 2013←12 Years→Current | Active | |
| Fletcher Engineering Group Limited Director • Engineer | 30 Apr 2013←12 Years→Current | Active | |
| Callow Engineering Limited Director • Unreported | 30 Apr 2013←12 Years→Current | Active | |
| Parex Mather Limited Director • Unreported | 30 Apr 2013←12 Years→Current | Active | |
| Sir James Farmer Norton (UK) Limited Director • Engineer | 30 Apr 2013←12 Years→Current | Active | |
| J. Fletcher (Engineers) Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
