| Company | Timeline | Status | |
| European Corrosion Limited Director • Mechanical Engineer | 13 Nov 2018←6 Years→Current | Active | |
| European Corrosion Services Limited Director • Mechanical Engineer | 13 Nov 2018←6 Years→Current | Active | |
| European Corrosion (UK) Limited Director • Mechanical Engineer | 13 Nov 2018←6 Years→Current | Active | |
| Metal Samples Supplies Limited Director • Mechanical Engineer | 18 Oct 2018←7 Years→Current | Active | |
| Mayes-UK Limited Director • Director | 14 Jan 2016←9 Years→Current | Active | |
| John Mayes Engineers Limited Director • Managing Director | 16 Mar 2010←15 Years→Current | Active | |
