| Company | Timeline | Status | |
| Calder Group Holdings Limited Director • Unreported | 29 Oct 2025←9 Days→Current | Active | |
| Calder Industrial Materials Limited Director • Unreported | 5 Sep 2022←3 Years→Current | Active | |
| Blotter Limited Director • Director | 15 May 2019←1 Year 4 Months→17 Sep 2020 | Active | |
| Eco-Bat Technologies GB Director • Director | 15 May 2019←1 Year 6 Months→16 Nov 2020 | Active | |
| H.J. Enthoven & Sons Limited Director • Director | 15 May 2019←1 Year 4 Months→17 Sep 2020 | Active | |
| BLM Limited Director • Director | 15 May 2019←1 Year 4 Months→17 Sep 2020 | Dissolved | |
| British Lead Mills Limited Director • Director | 15 May 2019←11 Months→17 Apr 2020 | Dissolved | |
| Hje Limited Director • Director | 15 May 2019←1 Year 4 Months→17 Sep 2020 | Active | |
| Ecobat Resources UK Limited Director • Director | 15 May 2019←1 Year 6 Months→16 Nov 2020 | Active | |
| G. & P. Batteries Limited Director • Director | 15 May 2019←1 Year 4 Months→17 Sep 2020 | Dissolved | |
