| Company | Timeline | Status | |
Roger Keech Productions Limited Director • Company Director | 29 Sep 2017←1 Year 5 Months→26 Mar 2019 | Dissolved | |
| Hydraulic Analysis Limited Director • Director | 10 Jun 2009←16 Years→Current | Active | |
| Hydraulic Analysis Group Limited Director • Aeronautical Engineer | 14 Aug 1991←34 Years→Current | Active | |
| Hydranal Projects Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
| Simulation Software Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
| Universal Property Interests Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
