| Company | Timeline | Status | |
| Plumer Management Limited Director • Author  | 31 May 1991←34 Years→Current  | Active  | |
| Plumer Management Limited Secretary • Unreported  | 31 May 1991←19 Years→19 Jan 2011  | Active  | |
| Plumer Management Limited Director • Author  | 1 Jan 1970←55 Years→4 Jul 2025  | Active  | |
