| Company | Timeline | Status | |
Thorngrow Limited Director • Engineer | 15 Jul 1999←20 Years→26 Dec 2019 | Dissolved | |
| The International Glassfibre Reinforced Concrete Association Director • Development Engineer | 14 Sep 1992←9 Years→14 Feb 2002 | Active | |
| BCM GRC Limited Director • Engineer | 31 Aug 1991←9 Years→2 Mar 2001 | Active | |
