| Company | Timeline | Status | |
| Pulsar Instruments Plc Director • Company Secretary/director | 8 May 2018←4 Years→2 Aug 2022 | Active | |
Safety Instruments International Ltd Director • Director | 1 Mar 2000←8 Years→12 Jan 2009 | Dissolved | |
| Acoustic Instruments International Limited Director • Company Director | 5 Feb 1992←17 Years→16 Nov 2009 | Dissolved | |
| Pulsar Instruments Plc Director • Company Director/secretary | 31 Jan 1992←17 Years→16 Nov 2009 | Active | |
| Aco Acoustics Limited Director • Co Secretary/director | 18 Oct 1991←34 Years→Current | Active | |
| Llorel Limited Director • Proposed Director | 23 Jan 1991←7 Months→27 Aug 1991 | Active | |
| Cirrus Research Plc Director • Director/co Secretary | 31 Dec 1990←18 Years→16 Nov 2009 | Active | |
