| Company | Timeline | Status | |
| J.C. Coster (Metalworks) Limited Secretary • Unreported | 2 Jan 2006←20 Years→Current | Active | |
| J & L Coster (Drainage) Limited Secretary • Unreported | 5 Jul 2001←1 Year 12 Months→1 Jul 2003 | Active | |
| J.C. Coster (Metalworks) Limited Director • Contracts Manager | 9 Mar 2000←25 Years→Current | Active | |
