| Company | Timeline | Status | |
| Planning Potential Trustees Ltd Director • Director | 8 Jan 2025←9 Months→Current | Active | |
| Markides Associates Employee Ownership Trustees Limited Director • Transport Planner | 21 Oct 2020←5 Years→Current | Active | |
| Markides Associates Limited Director • Transport Planner | 1 Nov 2016←8 Years→Current | Active | |
| Colin Buchanan And Partners Limited Director • Consultant | 23 Jan 2006←19 Years→Current | Active | |
| Colin Buchanan And Partners Limited Director • Consultant | 14 Nov 2000←10 Years→2 Jun 2011 | Dissolved | |
