| Company | Timeline | Status | |
| Mineral Products Association Limited Director • Chief Operating Officer | 13 Aug 2018←4 Years→5 Oct 2022 | Active | |
| British Precast Concrete Federation Limited(The) Director • Chief Operating Officer | 13 Aug 2018←6 Years→19 Aug 2024 | Active | |
| Brett Concrete Limited Director • Director | 1 Jul 2015←5 Years→31 Dec 2020 | Active | |
| Brett Aggregates Limited Director • Director | 1 Jul 2015←5 Years→31 Dec 2020 | Active | |
| Robert Brett & Sons Limited Director • Director | 1 Jul 2015←5 Years→31 Dec 2020 | Active | |
| Brett Landscaping Limited Director • Supplier Of Construction Materials And S | 1 Mar 2012←8 Years→31 Dec 2020 | Active | |
| Welsh Slate Limited Director • Company Director | 24 Dec 2007←5 Years→30 Apr 2013 | Active | |
| Cwmorthin Slate Quarry 1994 Company Limited Director • Company Director | 24 Dec 2007←5 Years→30 Apr 2013 | Active | |
| Cocklebank Conservations Limited Director • Company Director | 24 Dec 2007←5 Years→30 Apr 2013 | Active | |
| Alfred McAlpine Slate Penrhyn Limited Director • Company Director | 24 Dec 2007←5 Years→30 Apr 2013 | Active | |
