| 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 | 01 Jan 2023 | | 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 |
| FEATHER, David Robert Eliis RESIGNED | Secretary | 08 Jun 1994 | 31 May 1998 | | | Yew Tree Cottage, Crazies Hill, Wargrave, Berkshire, RG10 8LY |
| HALLISEY, Brian RESIGNED | Secretary | 31 May 1998 | 07 Nov 2003 | | | Ton Newydd, 4 The Grove, Merthyr Tydfil, CF47 8YR |
| HILL, Alan RESIGNED | Secretary | | 08 Jun 1994 | | | 82 Kings Ride, Camberley, Surrey, GU15 4LN |
| JENKINS, Howard Rhys RESIGNED | Secretary | 02 May 2013 | 25 Jun 2015 | | | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| JENKINS, Howard Rhys RESIGNED | Secretary | 07 Nov 2003 | 29 Sep 2012 | | | 1 The Coppice, Tudor Mews, Miskin, Pontyclun, CF72 8SU |
| MORAS, Yves RESIGNED | Secretary | 01 Oct 2012 | 02 May 2013 | | | Unit 29, 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 |
| BELLEVILLE, Maryse RESIGNED | Director | | 05 May 1995 | | June 1935 | 27 Avenue Lacassgne, Residense Floretien, Lyon 69003, FOREIGN, France |
| BOISVERT, Marie-Claude RESIGNED | Director | 31 May 2010 | 02 May 2013 | Canada | May 1972 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| BON HOMME, Yves RESIGNED | Director | | 01 Jul 1998 | | May 1945 | 21 Avenue De La Paix, Le Buclay, Charbonnieres 69260, FOREIGN, France |
| BOUVIER, Pierre-Francois RESIGNED | Director | 17 Mar 1993 | 01 Jul 1998 | | February 1951 | 2 Rue Tete D`Or, Lyon, 69006, France |
| CAILLE, Louis RESIGNED | Director | 22 Aug 2008 | 31 May 2010 | Canada | July 1961 | 38, De Franchimont, Blainville, Quebec, Canada |
| CHARTIER, Fabrice Guy, Dr RESIGNED | Director | 18 Jun 2014 | 21 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 | 22 Jun 2015 | United Kingdom | November 1957 | Berkeley Square House, Berkeley Square, London, W1J 6BD, England |
| GAGNON, Nathalie RESIGNED | Director | 22 Aug 2008 | 31 Dec 2009 | | January 1968 | 1023, De Lavande, Laval H7y 2g6, Quebec, Canada |
| 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 |
| HALLISEY, Brian RESIGNED | Director | 31 Jul 2003 | 22 Aug 2008 | | March 1943 | Ton Newydd, 4 The Grove, Merthyr Tydfil, CF47 8YR |
| JENKINS, Howard Rhys RESIGNED | Director | 02 May 2013 | 10 Jul 2015 | United Kingdom | January 1950 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| JENKINS, Howard Rhys RESIGNED | Director | 31 Jul 2003 | 29 Sep 2012 | United Kingdom | January 1950 | 1 The Coppice, Tudor Mews, Miskin, Pontyclun, CF72 8SU |
| JONES, Trevor Mervyn RESIGNED | Director | 29 May 2013 | 22 Jun 2015 | England | August 1942 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| JULLIARD, Jean-Noel RESIGNED | Director | 01 Jul 1998 | 31 Jul 2003 | | December 1951 | 6 Chemin De Chavril, Sainte Foy Les Lyon, 69110 France, FOREIGN |
| LA FORGE, Andre RESIGNED | Director | 22 Aug 2008 | 31 May 2010 | Canada | April 1960 | 309, Brock Avenue North, Montreal-West H4x 2g4, Quebec, Canada |
| MADDOCK, Jeffrey RESIGNED | Director | | 31 Jul 2003 | | August 1942 | 3 Gobannium Way, Ysbytty Fields, Abergavenny, Gwent, NP7 9JA |
| MAUDE, John Bagshaw RESIGNED | Director | | 01 Apr 1993 | | July 1939 | The Spinney Chequers Lane, Preston, Hitchin, Hertfordshire, SG4 7TX |
| MEYNAUD, Andre RESIGNED | Director | 01 Jul 1998 | 31 Jul 2003 | | February 1942 | 24 Rue Dellevaux, Champagne Au Mont D'Or, 69410 France, FOREIGN |
| MORAS, Yves RESIGNED | Director | 01 Oct 2012 | 02 May 2013 | Wales | September 1968 | Unit 29, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, United Kingdom |
| OPENSHAW, James Ronald RESIGNED | Director | 27 Apr 2017 | 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 |
| PEEL, Doug RESIGNED | Director | 31 May 2010 | 02 May 2013 | Canada | May 1948 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| TANNER, Trevor RESIGNED | Director | 02 May 2013 | 22 Jun 2015 | Wales | March 1951 | Simbec House, Merthyr Tydfil Industrial Park, Pentrebach, Merthyr Tydfil, Mid Glamorgan, CF48 4DR, Wales |
| TANNER, Trevor RESIGNED | Director | 31 Jul 2003 | 29 Sep 2012 | Wales | March 1951 | 6 Hampshire Crescent, Newport, NP19 4QN |