| Company | Timeline | Status | |
| Harley Gallery Nominees Limited Director • Retired | 17 May 2024←1 Year 5 Months→Current | Active | |
| Mark Roberts Conservation Limited Director • Paintings Restorer | 22 Aug 2007←16 Years→1 Mar 2024 | Dissolved | |
| Mark Roberts Conservation Limited Secretary • Unreported | 22 Aug 2007←16 Years→1 Mar 2024 | Dissolved | |
