| Company | Timeline | Status | |
| Tomkinson Biomass Limited Director • Director  | 14 Sep 2012←13 Years→Current  | Active  | |
| A. Tomkinson & Sons Limited Secretary • Unreported  | 5 Apr 2008←17 Years→Current  | Active  | |
| Tomkinson Heating Ltd Director • Unreported  | 8 Apr 1994←31 Years→Current  | Liquidation  | |
| A. Tomkinson & Sons Limited Director • Manager  | 31 Dec 1991←33 Years→Current  | Active  | |
