| Company | Timeline | Status | |
| Northumberland Stone Limited Secretary • Unreported | 24 Oct 2000←25 Years→Current | Active | |
| Onyx Contractors Limited Secretary • Unreported | 27 Jun 2000←25 Years→Current | Active | |
| WM.Allison & Sons Limited Secretary • Unreported | 27 Jun 2000←5 Years→8 May 2006 | Active | |
| Northumberland Stone Limited Director • Unreported | 10 Sep 1998←27 Years→Current | Active | |
| Onyx Contractors Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
| Dunhouse Quarry Co.Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
| WM.Allison & Sons Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
