| Company | Timeline | Status | |
| Sierra Integrated Systems Limited Director • Electrical Engineer | 17 Dec 1991←29 Years→30 Nov 2021 | Dissolved | |
| Sierra Integrated Systems Limited Secretary • Unreported | 17 Dec 1991←29 Years→30 Nov 2021 | Dissolved | |
| Trusound Limited Director • Director | 13 Apr 1991←6 Months→11 Oct 1991 | Active | |
| Securitas Technology Operations Limited Director • Director | 13 Apr 1991←6 Months→11 Oct 1991 | Dissolved | |
| Trusound Manufacturing Limited Director • Director | 13 Apr 1991←6 Months→11 Oct 1991 | Active | |
| Blick Telefusion (Scotland) Limited Director • Director | 2 Apr 1990←1 Year 6 Months→11 Oct 1991 | Active | |
