| Company | Timeline | Status | |
| Plummer Consulting Limited Director • Consultant | 29 Sep 2025←3 Months→Current | Active | |
| National Energy System Operator Limited Director • Company Director | 1 Apr 2019←6 Years→Current | Active | |
| Train Information Services Limited Director • Company Director | 17 Dec 2015←4 Years→1 Dec 2020 | Active | |
| National Rail Limited Director • Company Director | 17 Dec 2015←4 Years→1 Dec 2020 | Active | |
| Nres Limited Director • Company Director | 17 Dec 2015←4 Years→1 Dec 2020 | Active | |
| Rail Settlement Plan Limited Director • Company Director | 17 Dec 2015←4 Years→1 Dec 2020 | Active | |
| Atoc Limited Director • Company Director | 17 Dec 2015←4 Years→1 Dec 2020 | Active | |
| Rail Delivery Group Limited Director • Company Director | 13 Feb 2013←7 Years→1 Dec 2020 | Active | |
| Network Rail Holdco Limited Director • Director | 11 Oct 2010←5 Years→1 Nov 2015 | Active | |
| Network Rail Limited Director • Company Director | 1 Oct 2008←7 Years→1 Nov 2015 | Active | |
