| Company | Timeline | Status | |
T & R Holdings (Investments) Limited Secretary • Unreported | 4 Oct 2006←8 Years→16 Oct 2014 | Dissolved | |
| T & R Test (Holdings) Limited Secretary • Unreported | 4 Oct 2006←9 Years→29 Feb 2016 | Active | |
| Transformers & Rectifiers (Holdings) Limited Secretary • Unreported | 4 Oct 2006←9 Years→29 Feb 2016 | Active | |
T & R Holdings Limited Secretary • Unreported | 28 May 2004←10 Years→16 Oct 2014 | Dissolved | |
| RSL No.18 Limited Secretary • Unreported | 28 May 2004←11 Years→17 Jun 2015 | Dissolved | |
| T. & R. Test Equipment Limited Secretary • Unreported | 28 May 2004←11 Years→29 Feb 2016 | Active | |
| Brentford Electric Limited Secretary • Unreported | 28 May 2004←11 Years→29 Feb 2016 | Active | |
| Southern Transformer Products Limited Secretary • Unreported | 28 May 2004←11 Years→29 Feb 2016 | Active | |
| Brentford Regulators Limited Secretary • Unreported | 28 May 2004←11 Years→29 Feb 2016 | Active | |
| Transformers & Rectifiers Limited Secretary • Unreported | 28 May 2004←11 Years→29 Feb 2016 | Active | |
