| Company | Timeline | Status | |
| The Aes Tring Park School Trust Director • Certified Chartered Accountant | 10 Jan 2023←2 Years 9 Months→Current | Active | |
| S.D.K. Educational Consultancy Limited Director • Chartered Accountant | 9 Nov 2005←19 Years→Current | Active | |
| S. D. Knee Limited Director • Chartered Accountant | 19 Oct 2005←20 Years→Current | Active | |
| Dennis & Turnbull Limited Director • Chartered Accountant | 1 Feb 2004←1 Year 9 Months→31 Oct 2005 | Active | |
