| Company | Timeline | Status | |
| Ap Farm Solutions Limited Director • Director | 16 Oct 2024←2 Months→19 Dec 2024 | Active | |
| Barkwith Chemical Limited Director • Director | 18 Sep 2023←2 Years 3 Months→Current | Active | |
| British Chemicals Association Director • Chemical Consultant | 20 Jul 2022←3 Years→Current | Active | |
| Soil Harmony Limited Director • Consultant | 17 Apr 2015←6 Years→21 Sep 2021 | Dissolved | |
Zea Sciences Limited Director • Director | 1 Jan 2010←8 Years→20 Feb 2018 | Dissolved | |
| Ilex Envirosciences Limited Director • Manager | 10 Dec 2003←21 Years→16 Dec 2024 | Active | |
P & B Solutions Limited Director • Scientific Consultant | 23 May 2003←17 Years→10 Nov 2020 | Dissolved | |
| Barkwith Associates Limited Director • Pesticide Consultant | 25 Sep 2002←23 Years→Current | Active | |
