| Company | Timeline | Status | |
| R & W M Hill (Holdings) Limited Director • Electrical Engineer | 8 Jul 2011←14 Years→Current | Active | |
Robert Hill & Co (Hoover Services) Limited Director • Electrical Engineer | 25 Jan 1993←22 Years→1 May 2015 | Dissolved | |
| Hilcon Electrical Control Engineers Limited Director • Electrical Engineer | 31 Jul 1991←34 Years→Current | Liquidation | |
| Robert Hill & Company (Electrical Engineers) Limited Director • Electrician | 31 Dec 1988←36 Years→Current | Active | |
