| OSMOND, Charlotte Anne ACTIVE | Secretary | 17 Sep 2024 | | | | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| EDWARDS, Ceri Elizabeth ACTIVE | Director | 17 Aug 2026 | | Wales | May 1978 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| TRUS, Mark Joseph ACTIVE | Director | 21 May 2024 | | United States | March 1963 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| JENKINS, Howard Rhys RESIGNED | Secretary | 18 Apr 2013 | 22 Jun 2015 | | | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| PICARD, Alexandra RESIGNED | Secretary | 22 Jun 2015 | 16 Sep 2016 | | | 7 Bath Road, Bath Road, Slough, SL1 3UA, England |
| CHARTIER, Fabrice Guy, Dr RESIGNED | Director | 18 Jun 2014 | 17 Aug 2026 | France | February 1965 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| EVANS, Christopher Thomas, Professor RESIGNED | Director | 02 May 2013 | 30 Jan 2019 | United Kingdom | November 1957 | Berkeley Square House, Berkeley Square, London, W1J 6BD, England |
| GAHAN, John Richard RESIGNED | Director | 28 Jun 2019 | 29 Aug 2024 | England | January 1970 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| HALL, Frank Matthew Sunderland RESIGNED | Director | 17 Sep 2015 | 31 May 2017 | England | June 1960 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| HANNIGAN, Christopher Paul RESIGNED | Director | 26 Apr 2018 | 30 Jan 2019 | England | December 1963 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| JENKINS, Howard Rhys RESIGNED | Director | 02 Apr 2013 | 30 Jan 2019 | United Kingdom | January 1950 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| JONES, Trevor Mervyn RESIGNED | Director | 29 May 2013 | 30 Jan 2019 | England | August 1942 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| OPENSHAW, James Ronald RESIGNED | Director | 10 May 2016 | 16 Nov 2019 | United Kingdom | April 1966 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| OPENSHAW, James Ronald RESIGNED | Director | 18 Jun 2014 | 26 Apr 2016 | United Kingdom | April 1966 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| PATEL, Hemant RESIGNED | Director | 28 Jun 2019 | 31 Mar 2020 | England | March 1960 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |
| RAYNER, Edward John RESIGNED | Director | 30 Nov 2017 | 30 Jan 2019 | United Kingdom | June 1971 | 20, Berkeley Square, London, W1J 6EQ, England |
| TANNER, Trevor RESIGNED | Director | 18 Apr 2013 | 30 Apr 2016 | Wales | March 1951 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| WALTON, Martin Charles RESIGNED | Director | 30 Nov 2017 | 30 Jan 2019 | England | October 1963 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR |