| Company | Timeline | Status | |
| David Taylor Advisory Services Ltd Director • Director | 9 Oct 2025←1 Month→Current | Active | |
| Costain Energy Solutions Limited Director • Group Commercial Director | 30 Nov 2020←3 Years→8 Jul 2024 | Active | |
| Cogap (Middle East) Limited Director • Group Commercial Director | 30 Nov 2020←3 Years→8 Jul 2024 | Active | |
| Costain Engineering & Construction (Overseas) Limited Director • Group Commerical Director | 30 Nov 2020←3 Years→8 Jul 2024 | Active | |
| Costain Oil, Gas & Process (Overseas) Limited Director • Group Commercial Director | 30 Nov 2020←3 Years→8 Jul 2024 | Active | |
| Costain International Limited Director • Group Commercial Director | 30 Nov 2020←3 Years→8 Jul 2024 | Dissolved | |
| Westminster Plant Co. Limited Director • Group Commercial Director | 30 Nov 2020←3 Years→8 Jul 2024 | Dissolved | |
| RG Bidco Limited Director • Commercial Director | 1 Sep 2020←11 Months→10 Aug 2021 | Dissolved | |
| Rhead Group Holdings Limited Director • Commercial Director | 1 Sep 2020←11 Months→10 Aug 2021 | Dissolved | |
| Rhead Holdings Limited Director • Commercial Director | 1 Sep 2020←11 Months→10 Aug 2021 | Dissolved | |
