| Company | Timeline | Status | |
| Sir J.H.Biles & Co.Limited Director • Engineer | 20 Jan 1999←26 Years→17 Nov 2025 | Active | |
| Clark & Standfield Limited Director • Engineer | 3 Jan 1992←3 Years→25 May 1995 | Active | |
| Alluvial Dredges Limited Director • Engineer | 31 Dec 1991←3 Years→25 May 1995 | Active | |
| Whitehurst Controls Limited Director • Engineer | 31 Dec 1990←34 Years→Current | Liquidation | |
Fleming & Ferguson, Limited Director • Engineer | 5 Apr 1990←5 Years→25 May 1995 | Active | |
| Seadrec Limited Director • Engineer | 13 Jan 1989←6 Years→25 May 1995 | Active | |
