| Company | Timeline | Status | |
| GT Aviation (Elwick) LLP Designated LLP Member • Unreported | 22 Feb 2019←6 Years→Current | Active | |
| Turnbull Family Investments Limited Director • Director | 5 Jul 2016←5 Years→6 Sep 2021 | Active | |
| GT Envirotec Limited Secretary • Unreported | 16 Nov 1999←21 Years→19 Jan 2021 | Dissolved | |
| Kefco Precision Engineers (Peterlee) Limited Secretary • Unreported | 16 Nov 1999←21 Years→19 Jan 2021 | Dissolved | |
| GT Technology Limited Secretary • Unreported | 16 Nov 1999←21 Years→6 Jul 2021 | Dissolved | |
| G T Coatings Limited Director • Unreported | 13 Oct 1995←16 Years→31 Oct 2011 | Active | |
| Turnbull Family Developments Limited Director • Unreported | 2 Oct 1995←25 Years→6 Sep 2021 | Active | |
| Turnbull Precision Products Limited Director • Director | 31 Oct 1992←28 Years→19 Jan 2021 | Dissolved | |
| Alpha Process Controls (International) Limited Director • Director | 31 Oct 1992←23 Years→5 Jul 2016 | Active | |
| G T Emissions Systems Limited Director • Director | 31 Oct 1992←10 Years→6 Aug 2003 | Active | |
