| SHARPER, Ian David ACTIVE | Secretary | 02 Nov 2015 | | | | St Andrew's House, St Andrew's Road, Avonmouth, Bristol, BS11 9DQ, England |
| TITE, Christopher Charles ACTIVE | Secretary | | | | | St Andrew's House, St Andrew's Road, Avonmouth, Bristol, BS11 9DQ, England |
| BROWN OBE, David Alfred John ACTIVE | Director | 29 Sep 2015 | | United Kingdom | May 1965 | St Andrew's House, St Andrew's Road, Avonmouth, Bristol, BS11 9DQ, England |
| ORD, David Charles, Sir ACTIVE | Director | | | England | July 1948 | Wraxall Court, Wraxall Hill, Wraxall, North Somerset, BS48 1NA |
| SKELTON, Martin Alexander RESIGNED | Secretary | | 02 Nov 2015 | | | Glenview Cottage, Pottery Lane, Littlethorpe, Ripon, North Yorkshire, HG4 3LS |
| ALLEN, Philip Hugh RESIGNED | Director | 04 Feb 2013 | 31 Mar 2014 | United Kingdom | April 1964 | Aberthaw Power Station, The Leys, Aberthaw, Barry, South Glamorgan, CF62 4ZW |
| BIRD, Simon Anthony RESIGNED | Director | 10 Apr 2003 | 04 Aug 2015 | England | August 1959 | 7 Mount Beacon, Lansdown, Bath, Somerset, BA1 5QP |
| CHAPMAN, Stephen RESIGNED | Director | 01 Oct 2014 | 01 Jan 2017 | United Kingdom | June 1962 | Level 8, 71 Queen Victoria Street, London, EC4V 4AY, United Kingdom |
| COUNT, Brian Morrison, Dr RESIGNED | Director | 22 Dec 1993 | 23 Nov 1995 | England | February 1951 | Oakwood House, Blindmans Gate Woolton Hill, Newbury, Berkshire, RG20 9XD |
| GLOVER, Thomas Christian RESIGNED | Director | 01 Mar 2010 | 01 Oct 2014 | England | February 1975 | 11, The Damsells, Tetbury, Gloucestershire, GL8 8JA |
| HARRIS, John Robert Andrew RESIGNED | Director | 23 Nov 1999 | 23 Sep 2002 | | July 1950 | 4 Washbourne Road, Wootton Bassett, Swindon, Wiltshire, SN4 8BS |
| LITTLE, Richard John RESIGNED | Director | 31 Mar 2014 | 14 Feb 2019 | United Kingdom | January 1968 | Aberthaw Power Station, The Leys, Aberthaw, Barry, South Glamorgan, CF62 4ZW, United Kingdom |
| LOWBRIDGE, Michael Patrick RESIGNED | Director | 23 Sep 2002 | 15 Jun 2004 | | April 1951 | Lynton House, Chelworth Road Chelworth, Cricklade, Swindon, SN6 6HD |
| MCNAIR, Lawrence Keith RESIGNED | Director | 22 Dec 1993 | 29 Jan 1996 | | February 1949 | Braebank Cockpole Green, Wargrave, Reading, Berkshire, RG10 8NT |
| MORDAUNT, Terence Charles RESIGNED | Director | | 04 Aug 2025 | England | May 1947 | Westwood House, Rode Hill, Colerne, Chippenham, Wiltshire, SN14 8AR |
| O'CONNOR, Martin Peter, Dr RESIGNED | Director | 12 Jan 2017 | 14 Feb 2019 | England | September 1961 | Level 8, 71 Queen Victoria Street, London, EC4V 4AY, United Kingdom |
| RAINFORD, John Patrick RESIGNED | Director | 23 Sep 1999 | 16 Jan 2003 | United Kingdom | May 1952 | 24 Passey Crescent, Benson, Wallingford, Oxfordshire, OX10 6LD |
| RANS, Philip Edward RESIGNED | Director | 22 Dec 1993 | 10 Apr 2003 | | March 1938 | 7 Chantry Road, Clifton, Bristol, Avon, BS8 2QF |
| ROBINSON, Alan RESIGNED | Director | 19 May 2005 | 28 Feb 2010 | | February 1959 | Knights Close, Ball Hill, Newbury, Berkshire, RG20 0NN |
| ROBINSON, John RESIGNED | Director | 30 Jan 1996 | 23 Nov 1999 | | September 1948 | 32 The Close, Lydiard Millicent, Swindon, Wiltshire, SN5 9NJ |
| SKORUPSKA, Nina Maria, Dr RESIGNED | Director | 15 Jun 2004 | 19 May 2005 | United Kingdom | November 1961 | 162 Vansittart Road, Windsor, Berkshire, SL4 5DH |
| SMITH, Clive Anthony RESIGNED | Director | 16 Jan 2003 | 04 Feb 2013 | United Kingdom | March 1963 | Mynfa, Heol Y Mynydd,, Southerndown, Vale Of Glamorgan, CF32 0SN |
| TROTTER, John RESIGNED | Director | 24 Nov 1995 | 31 May 1999 | | February 1940 | Tamara Cottage, Llysworney, Cowbridge, CF71 7NQ |