| Company | Timeline | Status | |
| J A V Grazebrook & Co Limited Director • Engineer | 26 Jun 2015←10 Years→Current | Active | |
| Holtite Limited Director • Unreported | 1 Mar 1997←28 Years→Current | Active | |
| Isaiah Preston Limited Director • Engineer | 14 Feb 1992←34 Years→Current | Active | |
| Isaiah Preston Limited Director • Unreported | 1 Jan 1970←56 Years→Current | Active | |
