| Company | Timeline | Status | |
| Farnlea Estates Limited Director • Unreported | 25 Jul 2012←13 Years→Current | Active | |
| D.M.Keith (RGL) Limited Director • Company Director | 3 Mar 2009←12 Years→2 Jul 2021 | Active | |
| D.M.Keith (RGD) Limited Director • Company Director | 3 Mar 2009←12 Years→2 Jul 2021 | Active | |
| The Landmark Practice Limited Director • Company Director | 4 Apr 2006←13 Years→1 Oct 2019 | Active | |
| Avon Wildlife Consultants Limited Director • Landscape Architect | 14 May 2003←16 Years→1 Oct 2019 | Dissolved | |
| D.M.Keith (We) Limited Director • Company Director | 29 Oct 1991←29 Years→2 Jul 2021 | Active | |
| Landmark Environmental Consultants Limited Director • Landscape Architect | 26 Sep 1991←25 Years→5 May 2017 | Active | |
