| Company | Timeline | Status | |
| Derek Harper Foundries Limited Director • Office Manage | 26 Jan 2006←19 Years→Current | Active | |
| Derek Harper Foundries Limited Secretary • Office Manage | 26 Jan 2006←19 Years→Current | Active | |
| Derek Harper Foundries Limited Director • Office Manage | 26 Jan 2006←18 Years→30 Oct 2024 | Active | |
| Derek Harper Foundries Limited Secretary • Office Manage | 26 Jan 2006←18 Years→30 Oct 2024 | Active | |
