| Company | Timeline | Status | |
| C.A. Blackwell Group Limited Director • Civil Engineering Operational | 27 Apr 2007←5 Years→30 Jun 2012 | Active | |
| John Vincent Surveys Limited Director • Quantity Surveyor | 1 Mar 1999←11 Years→31 Dec 2010 | Active | |
| C. A. Blackwell (Contracts) Limited Director • Operational Civil Engineering | 1 Jan 1997←15 Years→30 Jun 2012 | Active | |
