| Company | Timeline | Status | |
| The New Science Of Fixing Things Limited Director • Engineer | 24 Jan 2006←19 Years→Current | Active | |
| The New Science Of Fixing Things Limited Secretary • Unreported | 24 Jan 2006←19 Years→Current | Active | |
| David Hartshorne Limited Secretary • Engineer | 30 Sep 1993←29 Years→24 Jan 2023 | Dissolved | |
| David Hartshorne Limited Director • Engineer | 30 Sep 1993←29 Years→24 Jan 2023 | Dissolved | |
