| Company | Timeline | Status | |
| Advent Maintenance Services Limited Director • Unreported | 15 Jun 2023←2 Years 5 Months→Current | Active | |
Bertram White Trust Limited Director • Housewife | 18 Nov 2014←1 Year 6 Months→17 May 2016 | Dissolved | |
| Hewer-White Trust Director • Unreported | 18 Nov 2014←10 Years→Current | Active | |
| Advent Ductwork Systems Ltd Director • Unreported | 12 May 1992←33 Years→Current | Active | |
| Advent Mechanical Services Ltd Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
