| Company | Timeline | Status | |
| R. Blackett & Son Limited Secretary • Retired | 28 Mar 2001←24 Years→Current | Active | |
| R. Blackett & Son Limited Director • Unreported | 7 Sep 2000←25 Years→Current | Active | |
| R. Blackett & Son Limited Secretary • Director | 1 Jan 1993←6 Years→1 Oct 1999 | Active | |
| R. Blackett & Son Limited Director • Contractor | 22 Nov 1991←7 Years→1 Oct 1999 | Active | |
