| Company | Timeline | Status | |
| Asbestos Removal Contractors Association Director • Company Chairman | 9 Oct 1991←1 Year 11 Months→15 Sep 1993 | Active | |
| T W W Realisations Limited Director • Company Director | 2 Sep 1991←34 Years→Current | Active | |
| W.B. Black & Sons (Holdings) Limited Director • Company Director | 31 Oct 1988←5 Years→5 Jul 1994 | Active | |
| P.P.M. (Glasgow) Limited Director • Company Director | 31 Oct 1988←5 Years→5 Jul 1994 | Dissolved | |
| SC063166 Limited Director • Unreported | 1 Jan 1970←24 Years→5 Jul 1994 | Active | |
