| Company | Timeline | Status | |
| Christopher Boyle Consultants Ltd Director • Engineer | 21 Sep 2010←15 Years→Current | Active | |
| Delap & Waller Mechanical & Electrical Consulting Engineers Limited Director • Engineer | 12 Apr 2002←2 Years 9 Months→31 Jan 2005 | Active | |
| Delap & Waller Limited Director • Engineer | 31 Dec 1987←17 Years→31 Jan 2005 | Active | |
