| Company | Timeline | Status | |
| Darenth River Ballast Company Limited(The) Director • Builder | 19 Nov 1991←15 Years→15 Oct 2007 | Active | |
| Durtnell Limited Director • Builder | 24 Sep 1991←16 Years→15 Oct 2007 | Active | |
| Darenth River Ballast Company Limited(The) Director • Unreported | 1 Jan 1970←37 Years→15 Oct 2007 | Active | |
