| Company | Timeline | Status | |
| Mason Valuation Consultants Limited Director • Unreported | 17 Jan 2025←1 Year→Current | Active | |
| Justin Mason Limited Director • Unreported | 5 Jan 2018←8 Years→Current | Active | |
| Knight Frank LLP Non-designated LLP Member • Unreported | 1 Apr 2010←7 Years→1 Jan 2018 | Active | |
