| VISTRA COSEC LIMITED ACTIVE | Secretary | 18 Mar 2026 | | | | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| FORTIN, Nicolas ACTIVE | Director | 30 Jun 2025 | | Canada | November 1974 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| HODGSON, Nicholas James ACTIVE | Director | 16 Jul 2025 | | United Kingdom | November 1978 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| KANAN, Michael Forrest ACTIVE | Director | 16 Jul 2025 | | United States | February 1963 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| BRYAN, Christopher John RESIGNED | Secretary | 31 Oct 2005 | 23 Feb 2007 | | | ME16 |
| CALDERBANK, Andrew Charles RESIGNED | Secretary | 28 Apr 1995 | 12 Jan 1996 | | | 75 Watermead, Bar Hill, Cambridge, Cambridgeshire, CB3 8TL |
| CHAMBERLAIN, Ian Philip RESIGNED | Secretary | 12 Jan 1996 | 06 May 1998 | | | 10 Orwell Road, Barrington, Cambridge, Cambridgeshire, CB2 5SE |
| COLLIVER, Valerie Anne RESIGNED | Secretary | 23 Feb 2007 | 29 May 2013 | | | 37 Hollands Road, Haverhill, Suffolk, CB9 8PU |
| COX, Sara RESIGNED | Secretary | 29 May 2013 | 20 Dec 2024 | | | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| HARROW, Terence Alfred, Dr RESIGNED | Secretary | 11 Mar 1999 | 31 Oct 2005 | | | Inglenook, Dedham Road Ardleigh, Colchester, Essex, CO7 7LL |
| MODI, Vishal RESIGNED | Secretary | 20 Dec 2024 | 30 Jun 2025 | | | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| PARISH, Ian Maxwell RESIGNED | Secretary | | 28 Apr 1995 | | | 2a Church Street, Histon, Cambridgeshire, CB24 9JG |
| SMITH, Christopher Robert RESIGNED | Secretary | 06 May 1998 | 06 May 1998 | | | 11 Hopton Rise, Haverhill, Suffolk, CB9 7FS |
| BAKER, Gary RESIGNED | Director | 27 Sep 2023 | 01 Mar 2025 | United Kingdom | September 1963 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| BAMFORTH, Mark Robert RESIGNED | Director | 09 Oct 1997 | 01 Mar 2010 | | January 1963 | 30 Lowell Road, Wellesley, Massachusetts 02481, Usa |
| BARKER, Richard Charles RESIGNED | Director | 29 Jun 1995 | 16 Jan 1998 | | March 1953 | 11 Fox Green, Great Bradley, Newmarket, Suffolk, CB8 9NR |
| BRYAN, Christopher John RESIGNED | Director | 13 Dec 2021 | 01 Aug 2024 | United Kingdom | October 1966 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, United Kingdom |
| BRYAN, Christopher John RESIGNED | Director | 27 Nov 2001 | 17 Feb 2017 | United Kingdom | October 1966 | ME16 |
| BUSH, David Anthony, Dr RESIGNED | Director | 29 Jun 1995 | 08 Apr 2005 | | November 1942 | The Croft Black Mill Lane, Headcorn, Ashford, Kent, TN27 9JT |
| CAROLAN, Dominic Joseph RESIGNED | Director | 23 Jun 2009 | 31 Jul 2014 | Ireland | June 1954 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU |
| CASPANI, Michael Martin RESIGNED | Director | 30 Jun 2025 | 16 Jul 2025 | United States | June 1984 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| CORTINOVIS, Matthieu Jean RESIGNED | Director | 16 Oct 2012 | 19 Nov 2014 | France | July 1966 | 37 Hollands Road, Haverhill, Suffolk, CB9 8PU |
| CORTVRIEND, Martin John RESIGNED | Director | 02 Nov 1999 | 05 Sep 2000 | | January 1952 | Kerridge Hill House, Windmill Lane, Kerridge, Macclesfield, Cheshire, SK10 5AZ |
| COUSINS, Simon John, Dr RESIGNED | Director | 05 Sep 2000 | 01 Nov 2009 | England | September 1954 | The Coach House, Coupals Road, Haverhill, Suffolk, CB9 7UW |
| COX, Geoffrey Frank, Dr RESIGNED | Director | | 29 Sep 1997 | | November 1943 | 25 Constitution Drive, Southborough, Massachusetts 01772, FOREIGN, Usa |
| COX, Sara RESIGNED | Director | 01 Aug 2024 | 30 Jun 2025 | United Kingdom | June 1977 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| DROHAN, Paul Victor RESIGNED | Director | 20 Jul 2005 | 25 May 2006 | Great Britain | July 1961 | 47 Frenchay Road, Oxford, Oxfordshire, OX2 6TF |
| DUHALDE, Francois Xavier RESIGNED | Director | 08 Jun 2016 | 31 Mar 2021 | France | July 1965 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| EDWARDS, Paul Martin RESIGNED | Director | 19 Apr 1993 | 12 Jan 1998 | | December 1956 | Copperfield House Church Street, Gestingthorpe, Halstead, Essex, CO9 3AZ |
| GAMSTON, John RESIGNED | Director | 19 Dec 2011 | 15 Jan 2014 | United Kingdom | January 1954 | 37 Hollands Road, Haverhill, Suffolk, CB9 8PU |
| GERAGHTY, James A RESIGNED | Director | 06 May 1998 | 02 Nov 1999 | | July 1954 | 28 Exeter Street 611, Boston, MA 02116, Usa |
| HALE, Arthur James, Doctor RESIGNED | Director | | 31 Dec 1993 | | July 1926 | Millstream, Mill Lane, Henley On Thames, Oxfordshire, RG9 4HB |
| HENNECKE, Derek George RESIGNED | Director | 30 Jun 2025 | 16 Jul 2025 | United States | July 1966 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| HODGSON, Nicholas James RESIGNED | Director | 01 Aug 2024 | 30 Jun 2025 | United Kingdom | November 1978 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| HODGSON, Nick RESIGNED | Director | 24 Sep 2014 | 13 Oct 2015 | England | November 1978 | 37 Hollands Road, Haverhill, Suffolk, CB9 8PU |
| INCERTI, Carlo, Dr RESIGNED | Director | 30 Nov 2004 | 25 May 2006 | | March 1959 | Via Obici 46, Modena, 41100, Italy |
| JOHNSON, Malcolm David RESIGNED | Director | 05 Sep 2000 | 25 Jan 2006 | | March 1952 | Arden House, Holtwood Avenue, Aylesford, Kent, ME20 7DH |
| KHAN, Usman RESIGNED | Director | 31 Mar 2021 | 13 Dec 2021 | England | June 1979 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| KIRKPATRICK, Shaun Alexander RESIGNED | Director | 30 Jun 2025 | 16 Jul 2025 | United States | November 1968 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| LEIGH PEMBERTON, Jeremy RESIGNED | Director | | 31 Dec 1993 | England | November 1933 | Hill House, Wormshill, Sittingbourne, Kent, ME9 0TS |
| LOGUE, Paul RESIGNED | Director | 23 Feb 2010 | 19 Dec 2011 | Ireland | November 1959 | 37 Hollands Road, Haverhill, Suffolk, CB9 8PU |
| MCLACHLAN, David John RESIGNED | Director | 13 Sep 1991 | 02 Nov 1999 | | August 1938 | 51 Brentwood Road, Chelmsford Massachusetts 01824, FOREIGN, Usa |
| MORETTA, James RESIGNED | Director | 14 May 2015 | 27 Sep 2023 | United Kingdom | January 1966 | 37, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| MORRIS, Steven RESIGNED | Director | 06 May 1998 | 23 Oct 2000 | | July 1965 | 31 Barbara Jean Street, Grafton, Massachusetts, 01519, Usa |
| O'CONNOR, Paul John RESIGNED | Director | 01 Apr 2005 | 26 Nov 2007 | | March 1964 | 18 Mote Avenue, Maidstone, Kent, ME15 7ST |
| OLLINGTON, James Frank, Dr RESIGNED | Director | 09 Oct 1997 | 07 Jul 2000 | | October 1952 | 1 Dove Lane, Lexington, MA 02421, Usa |
| PARISH, Ian Maxwell RESIGNED | Director | | 28 Apr 1995 | England | February 1948 | 2a Church Street, Histon, Cambridgeshire, CB24 9JG |
| POGORZELSKI, Donald RESIGNED | Director | 07 Jul 2000 | 22 Dec 2010 | Usa | February 1950 | 10 Scotland Drive, Andover, Massachusetts, 01810, Usa |
| POWER, John Anthony, Dr RESIGNED | Director | 26 Nov 2007 | 22 Dec 2010 | United Kingdom | June 1956 | No 3 Ragstones, Copse Bank Seal, Sevenoaks, Kent, TN15 0DQ |
| PROSSER, Andy RESIGNED | Director | 14 May 2015 | 08 Jun 2016 | England | April 1971 | 37 Hollands Road, Haverhill, Suffolk, CB9 8PU |
| SMITH, Paul Derek RESIGNED | Director | 24 Sep 2014 | 13 Oct 2015 | United Kingdom | July 1975 | 37 Hollands Road, Hollands Road, Haverhill, Suffolk, CB9 8PU, England |
| TERMEER, Henri Adrianus RESIGNED | Director | | 02 Nov 1999 | | February 1946 | 65-3 Commercial Wharf, Boston, Ma 02110, Usa |
| VAN HEEK, Gerrit Jan RESIGNED | Director | 01 Feb 1991 | 30 Oct 1997 | | May 1949 | Isaac Da Costalaan 34, 1401 Bj Bussum, The Netherlands |