| Company | Timeline | Status | |
| Society Of Environmental Engineers Director • Engineering | 5 Apr 2006←11 Years→15 Apr 2017 | Dissolved | |
Cambridge Vibration Maintenance Services Limited Director • Managing Director | 12 Oct 2001←5 Years→29 Jan 2007 | Dissolved | |
| Royston Masonic Hall Company Limited Director • Director | 20 Sep 1993←3 Years→27 Nov 1996 | Active | |
Vibration Maintenance Services Limited Director • Enviromental Engineer | 15 Jul 1991←22 Years→18 Feb 2014 | Dissolved | |
