| Company | Timeline | Status | |
| C. Firbank (Engineers) Limited Director • Director | 2 Mar 2005←20 Years→Current | Active | |
| Biffa GS (FC) Limited Director • Director | 16 Jun 2003←4 Years→27 Mar 2008 | Active | |
| C. Firbank And Son, Limited Director • Director | 7 Nov 1991←34 Years→Current | Active | |
| C. Firbank And Son, Limited Secretary • Director | 7 Nov 1991←34 Years→Current | Active | |
