| Company | Timeline | Status | |
| Gladstone Investments Limited Director • Estate Manager | 31 Dec 1990←34 Years→Current | Active | |
| St. Albans Realty Limited Director • Estate Manager | 31 Dec 1990←34 Years→Current | Active | |
| Alderton Hill Properties Limited Director • Estate Manager | 31 Dec 1990←34 Years→Current | Active | |
| John R.Keys & Co. Limited Director • Estate Manager | 31 Dec 1990←34 Years→Current | Active | |
| Highfield Place Properties Limited Director • Estate Manager | 31 Dec 1990←34 Years→Current | Active | |
| H.H.Keys Estates Limited Director • Estate Manager | 31 Dec 1990←34 Years→Current | Active | |
| Fillebrook Hall Estate Co., Limited Director • Estate Manager | 31 Dec 1990←34 Years→Current | Active | |
