| Company | Timeline | Status | |
| Scientific Measurements Limited Director • Director | 30 Sep 2023←2 Years→Current | Active | |
| Contract Production Limited Director • Retired | 23 Nov 2009←3 Years→31 May 2013 | Active | |
| Llorel Limited Director • Director | 3 Jan 2007←2 Years 4 Months→13 May 2009 | Active | |
| Acoustic Instruments International Limited Director • Company Director | 5 Feb 1992←17 Years→24 Apr 2009 | Dissolved | |
| Llorel Limited Director • Eng Manager | 23 Jan 1991←7 Months→27 Aug 1991 | Active | |
| Cirrus Research Plc Director • Electronic Engineer | 31 Dec 1990←34 Years→Current | Active | |
