| Company | Timeline | Status | |
| Ashgate Research Limited Director • Unreported | 23 May 2012←13 Years→Current | Active | |
The British Occupational Hygiene Society Director • Occupotinal Hygienst | 29 Apr 2009←4 Years→25 Mar 2014 | Dissolved | |
| Hirst Consulting Limited Director • Unreported | 17 Aug 2005←20 Years→Current | Active | |
