| Company | Timeline | Status | |
| Mason Valuation Consultants Limited Director • Chartered Surveyor | 17 Jan 2025←9 Months→Current | Active | |
| Justin Mason Limited Director • Chartered Surveyor | 5 Jan 2018←7 Years→Current | Active | |
| Knight Frank LLP Non-designated LLP Member • Unreported | 1 Apr 2010←7 Years→1 Jan 2018 | Active | |
