| Company | Timeline | Status | |
| O'Brien (WT) Consultancy Ltd Director • Unreported | 17 May 2022←3 Years→Current | Active | |
Howlett Water Treatment Ltd Director • None | 9 Nov 2010←5 Years→1 Dec 2015 | Dissolved | |
| Howlett Associates Water Treatment Limited Director • Unreported | 14 May 2001←24 Years→10 Dec 2025 | Active | |
