| Company | Timeline | Status | |
| Siemens Rail Systems Project Limited Director • Director | 21 Jun 2017←10 Months→30 Apr 2018 | Dissolved | |
| Siemens Rail Systems Project Holdings Limited Director • Director | 21 Jun 2017←10 Months→30 Apr 2018 | Dissolved | |
| Vernon Barker Consultancy Limited Director • Company Director | 2 Oct 2015←10 Years→Current | Active | |
| First Transpennine Express Limited Director • Company Director | 2 Jul 2014←9 Months→17 Apr 2015 | Active | |
| East Coast Trains Limited Director • Director | 7 Nov 2013←1 Year 5 Months→17 Apr 2015 | Active | |
| First International No.1 Limited Director • Director | 24 Oct 2013←1 Year 5 Months→17 Apr 2015 | Active | |
| First Capital North Limited Director • Director | 23 Oct 2013←1 Year 5 Months→17 Apr 2015 | Dissolved | |
| First International (Holdings) Limited Director • Director | 22 Oct 2013←1 Year 5 Months→17 Apr 2015 | Active | |
| First Scotrail Railways Limited Director • Director | 25 Jul 2013←1 Year 8 Months→17 Apr 2015 | Dissolved | |
| First Caledonian Sleeper Limited Director • Director | 2 May 2013←1 Year 11 Months→17 Apr 2015 | Dissolved | |
