| Company | Timeline | Status | |
| Penarth Headland Link Director • Civil Engineer (retired) | 9 Feb 2016←9 Years→Current | Active | |
| Penarth Headland Link Director • Civil Engineer (retired) | 9 Feb 2016←9 Years→20 Oct 2025 | Active | |
Gabe Treharne Limited Director • Consultant | 31 Mar 2008←11 Years→21 Jan 2020 | Dissolved | |
| Ove Arup & Partners Limited Director • Geotechnical Engineer | 27 Nov 1992←15 Years→31 Mar 2008 | Active | |
| Ove Arup & Partners International Limited Director • Geotechncial Engineer | 27 Nov 1991←10 Years→1 Jan 2002 | Active | |
