| BEACH, Jonathan ACTIVE | Director | 09 Sep 2025 | | United States | September 1979 | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| BROWN, Gareth Roger ACTIVE | Director | 17 Oct 2025 | | United Kingdom | February 1972 | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| RAMIREZ, Ernesto Alonzo ACTIVE | Director | 09 Sep 2025 | | United States | November 1974 | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| BANON, Jean Claude RESIGNED | Secretary | 25 Jul 1991 | 10 Sep 1991 | | | 37 Warwick Gardens, London, W14 8PH |
| BROWN, Michael Ross RESIGNED | Secretary | 15 Sep 1999 | 06 Apr 2000 | | | 1 Ayres End Cottages, Ayres End Lane, Harpenden, Hertfordshire, AL5 1AL |
| CAMPBELL, Audrey Clare RESIGNED | Secretary | 08 Jul 1991 | 25 Jul 1991 | | | 40 Ridgeway Gardens, London, N6 5XR |
| CASTLE, Rodney Grahame RESIGNED | Secretary | 17 Jun 1994 | 14 Dec 1995 | | | The Old Cottage, Wells Lane, Guildford, Surrey, GU3 2BS |
| HIGSON, Robert Ian RESIGNED | Secretary | 05 Apr 2000 | 17 Sep 2009 | | | Springfield, Calvert Road, Dorking, Surrey, RH4 1LT |
| SEFTON, Scott Matthew RESIGNED | Secretary | 14 Dec 1995 | 15 Sep 1999 | | | 249 Pavilion Road, London, SW1X 0BP |
| SOUTO, Joe RESIGNED | Secretary | 17 Sep 2009 | 27 Mar 2013 | | | 40 Grosvenor Place, Victoria, London, SW1X 7EN |
| TRZCINSKI, Pierre RESIGNED | Secretary | 10 Sep 1991 | 17 Jun 1994 | | | 11 Stanhope Gardens, London, SW7 5RG |
| ALTER DOMUS (UK) LIMITED RESIGNED | Secretary | 01 Dec 2014 | 01 Jan 2021 | | | 18, St. Swithin's Lane, London, EC4N 8AD, England |
| SWIFT INCORPORATIONS LIMITED RESIGNED | Nominee Secretary | 27 Feb 1991 | 09 Jul 1991 | | | 26, Church Street, London, NW8 8EP |
| ASIN RAMAJOS, Juan RESIGNED | Director | 25 Mar 1993 | 14 Dec 1995 | | December 1931 | Hermosilla 3, Madrid, 28001, Spain |
| BANON, Jean Claude RESIGNED | Director | | 14 Dec 1995 | United Kingdom | May 1948 | 37 Warwick Gardens, London, W14 8PH |
| BEAMENT, Ian Roger RESIGNED | Director | 06 Apr 2000 | 01 Apr 2003 | | July 1944 | 24 The Grove, Brookmans Park, Hatfield, Hertfordshire, AL9 7RN |
| BOYD, Gordon Alexander RESIGNED | Director | 16 Jul 2010 | 31 Aug 2011 | England | February 1960 | 17, Brook Farm Road, Surrey, KT11 3AX, United Kingdom |
| CADOUX HUDSON, Humphrey Alan Edward RESIGNED | Director | 01 Apr 2003 | 01 Apr 2009 | | November 1960 | 40, Grosvenor Place, Victoria, London, SW1X 7EN |
| CAMPBELL, Audrey Clare RESIGNED | Director | 08 Jul 1991 | 25 Jul 1991 | | November 1959 | 40 Ridgeway Gardens, London, N6 5XR |
| CHAMP, Philip James RESIGNED | Director | 29 Jul 1991 | 09 Feb 1994 | United Kingdom | February 1942 | Bridlewood, 18 Kighill Lane, Ravenshead, Nottingham, NG15 9HN |
| CHIVERS, Paul Clifford RESIGNED | Director | 30 Sep 1998 | 06 Apr 2000 | England | April 1962 | 7 Randolph Road, London, W9 1AN |
| CUTTILL, Paul Andrew RESIGNED | Director | 04 Jan 2001 | 01 Apr 2003 | | May 1959 | 25 Bushey Avenue, South Woodford, London, E18 2DT |
| DANIELS, Christopher John RESIGNED | Director | 01 Apr 2003 | 09 Mar 2007 | | March 1947 | Mistletoe Cottage, 57 Wickham Hill, Hurstpierpoint, West Sussex, BN6 9NR |
| DE RIVAZ, Vincent RESIGNED | Director | 07 Feb 2002 | 01 Apr 2003 | | October 1953 | 20 Astell Street, Chelsea, London, SW3 3RU |
| DERRICK, James Vinson RESIGNED | Director | 12 May 1997 | 06 Apr 2000 | | January 1945 | 1824 Larchmont, Houston Texas 77019, Usa |
| DIMICHELE, Richard Guido RESIGNED | Director | 03 Feb 1997 | 24 Sep 1999 | | December 1959 | 3 Mansion Gardens, London, NW3 7NG |
| DYSON, Fernley Keith RESIGNED | Director | 12 Mar 1999 | 06 Apr 2000 | | February 1965 | The Picketts, 15 Picketts Road, Old Felixstowe, Suffolk, IP11 7JT |
| EWELL, Margaret Bollinger RESIGNED | Director | 19 Aug 1997 | 09 Nov 1999 | | November 1954 | 9 Court Lodge, 48 Sloane Square, London, SW1W 8AT |
| EZRA OF HORSHAM, Derek, Lord RESIGNED | Director | | 14 Dec 1995 | | February 1919 | 43 Eaton Terrace, London, SW1W 8TR |
| FAVEZ, Bernard Edouard RESIGNED | Director | 29 Jul 1991 | 14 Dec 1995 | | September 1928 | 39 Rue Jouvenet, Paris 75016, France |
| FEAKINS, Alan Timothy RESIGNED | Director | 29 May 2009 | 27 Mar 2013 | United Kingdom | October 1961 | 40 Grosvenor Place, Victoria, London, SW1X 7EN |
| FREVERT, Mark Albert RESIGNED | Director | 26 Feb 1997 | 06 Apr 2000 | | February 1954 | 4 St Marys Place, Marloes Road, London, W8 5UE |
| GALLAND, Jean Baptiste RESIGNED | Director | 01 Apr 2009 | 06 Aug 2010 | England | June 1957 | 44 Victoria Road, London, W8 5RQ |
| GANIAGE, Dominique RESIGNED | Director | 08 Feb 1995 | 14 Dec 1995 | | July 1953 | 5 Rue Marbeau, 75116 Paris, France, FOREIGN |
| GEORGIOU, Roulla RESIGNED | Director | 09 Jul 1991 | 25 Jul 1991 | | June 1966 | 67 Grosvenor Road, London, N9 8RG |
| GRIFFITHS, Rees RESIGNED | Director | 25 Jul 1991 | 29 Jul 1991 | | December 1947 | 13 Allfarthing Lane, London, SW18 2PG |
| GUERY, Jean-Pierre RESIGNED | Director | 29 Jul 1991 | 14 Dec 1995 | | April 1940 | 69 Avenue De Suffien, Paris, 75017, France |
| GUYLER, Robert RESIGNED | Director | 09 Apr 2009 | 16 Jul 2010 | Scotland | December 1966 | Fairfield, Manse Street, Kilmacolm, Renfrewshire, PA13 4NH, Scotland |
| HARGREAVES, Stephen John RESIGNED | Director | 31 Aug 2010 | 27 Mar 2013 | United Kingdom | March 1966 | 40 Grosvenor Place, Victoria, London, SW1X 7EN |
| HARGREAVES, Stephen John RESIGNED | Director | 06 Aug 2010 | 06 Aug 2010 | England | March 1966 | 62, Peacock Lane, Brighton, East Sussex, BN1 6WA, England |
| HARRIS, John Frederick RESIGNED | Director | 29 Jul 1991 | 16 Jun 1994 | England | December 1938 | 57 Sheepwalk Lane, Ravenshead, Nottingham, NG15 9FD |
| HIGGINBOTHAM, Michael David RESIGNED | Director | 19 Feb 2015 | 09 Feb 2021 | England | September 1977 | Severn Power Station, West Nash Road, Nash, Newport, Gwent, NP18 2BZ, Wales |
| HOLDER, Jeffrey James RESIGNED | Director | 05 Aug 2020 | 09 Sep 2025 | England | February 1976 | Severn Power Station, West Nash Road, Nash, Newport, Gwent, NP18 2BZ, United Kingdom |
| KEOHANE, James Anthony RESIGNED | Director | 09 Feb 1994 | 14 Dec 1995 | | August 1949 | 3 Main Street, Woodborough, Nottingham, Nottinghamshire, NG14 6EA |
| LAWRENCE, Martin Charles RESIGNED | Director | 09 Mar 2007 | 01 Apr 2009 | England | February 1958 | 12 Harebell Hill, Cobham, Surrey, KT11 2RS |
| LE MARECHAL, Tanneuy Marie Joseph RESIGNED | Director | 29 Jul 1991 | 08 Feb 1995 | | June 1939 | 33 Rue Nicolo, 75116 Paris, France |
| LESCOEUR, Bruno Jean RESIGNED | Director | 06 Apr 2000 | 07 Feb 2002 | | November 1953 | 20 Astell Street, Chelsea, London, SW3 |
| LEWIS, David John RESIGNED | Director | 14 Dec 1995 | 05 Nov 1999 | England | July 1955 | 46 Sutherland Avenue, Petts Wood, Orpington, Kent, BR5 1RB |
| LORY, Ronan Emmanuel RESIGNED | Director | 01 Sep 2011 | 27 Mar 2013 | United Kingdom | October 1976 | 40 Grosvenor Place, Victoria, London, SW1X 7EN |
| MABON, Jesse Dickson, The Right Honourable Doctor RESIGNED | Director | 29 Jul 1991 | 31 Aug 1994 | | November 1925 | 57 Hillway, Highgate, London, N6 6AD |
| MAGIE, Scott Mcnally RESIGNED | Director | 04 Feb 2021 | 09 Sep 2025 | United States | August 1965 | First Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, England |
| MATTATIA, Ronald RESIGNED | Director | 29 Jul 1991 | 14 Dec 1995 | | April 1944 | 14 Rue Des Mauniars, Paris, FOREIGN, France |
| MCCARTY, Danny Joe RESIGNED | Director | 03 Feb 1997 | 06 Apr 2000 | | May 1957 | Heath Corner, Queens Drive, Oxshott, Leatherhead, Surrey, KT22 0PB |
| MCCULLOUGH, Kevin RESIGNED | Director | 18 Nov 2014 | 25 Nov 2020 | United Kingdom | September 1965 | C/O Kpmg Llp, 15 Canada Square, London, E14 5GL |
| MCLEISH, Douglas Stuart RESIGNED | Director | 27 Mar 2013 | 03 Nov 2017 | England | February 1965 | Ropemaker Place, 28 Ropemaker Street, London, EC2Y 9HD, United Kingdom |
| MCMAHON, Jeffrey RESIGNED | Director | 12 May 1997 | 18 Jun 1998 | | October 1960 | Flat 2 13-14 Vicarage Gate, London, W8 4AG |
| METCALFE, Edward RESIGNED | Director | 11 Jul 2013 | 28 Jun 2020 | United Kingdom | October 1947 | Ropemaker Place, 28 Ropemaker Street, London, EC2Y 9HD, England |
| NORMAN, Angus Tindale RESIGNED | Director | 01 Apr 2009 | 29 May 2009 | | July 1950 | 81, Galloway Drive, Kennington, Ashford, Kent, TN25 4QQ, United Kingdom |
| NORMAN, Angus Tindale RESIGNED | Director | 04 Jan 2001 | 04 Sep 2005 | | July 1950 | 11 Granville Road, Walmer, Deal, Kent, CT14 7LU |
| OTERO-NOVAS MIRANDA, Irene RESIGNED | Director | 23 Feb 2018 | 29 Jun 2020 | United Kingdom | April 1972 | Severn Power Station, West Nash Road, Nash, Newport, Gwent, NP18 2BZ, United Kingdom |
| PARSONS, Gordon Ian Winston RESIGNED | Director | 27 Mar 2013 | 29 Jun 2020 | United Kingdom | September 1967 | Ropemaker Place, 28 Ropemaker Street, London, EC2Y 9HD, United Kingdom |
| PATERSON, Robert Murray RESIGNED | Director | 27 Mar 2013 | 31 Dec 2014 | England | September 1968 | Sutton Bridge Power Station, Centenary Way, Sutton Bridge, Spalding, Lincolnshire, PE12 9TF, England |
| RICE, Kenneth Duane RESIGNED | Director | 12 May 1997 | 20 Jul 1999 | | August 1958 | 4531 Birch, Bellaire, Texas, Usa |
| ROBERTS, Geoffrey RESIGNED | Director | 14 Dec 1995 | 03 Feb 1997 | | March 1960 | 16 Dunnan Lane, Houston, Texas 77381, Usa |
| SEXTON, Ian Anthony RESIGNED | Director | 04 Jul 1995 | 14 Dec 1995 | | May 1956 | 7 Sherwood Drive, Maidenhead, Berkshire, SL6 4NY |
| SHERRIFF, John Richard RESIGNED | Director | 19 Feb 1999 | 06 Apr 2000 | | September 1953 | 63 Hampstead Way, London, NW11 7DN |
| SKILLING, Jeffrey Keith RESIGNED | Director | 15 Jan 1996 | 30 Apr 1997 | | November 1953 | 1912 North Boulevard, Houston, Texas, 77098, Usa |
| STANLEY, George Brian RESIGNED | Director | 19 Aug 1997 | 06 Apr 2000 | | April 1944 | 14 Petworth Avenue, Toton, Nottingham, NG9 6JF |
| WALBRIDGE, Jonathan Paul RESIGNED | Director | 27 Mar 2013 | 08 Jul 2013 | United Kingdom | August 1978 | Ropemaker Place, 28 Ropemaker Street, London, EC2Y 9HD, United Kingdom |
| WATERSTONE, David George Stuart RESIGNED | Director | 29 Jul 1991 | 30 Apr 1995 | England | August 1935 | 1 Prior Park Buildings, Prior Park Road, Bath, BA2 4NP |
| WINGROVE, Gerald Langdon RESIGNED | Director | 06 Apr 2000 | 30 Sep 2002 | United Kingdom | October 1954 | 96 Albert Street, London, NW1 7NE |
| IBERDROLA II SA RESIGNED | Director | 29 Jul 1991 | 27 Feb 1993 | | | Hidroeldctricia Espanaola Sa, Hermosilla 3 Madrid 280001, FOREIGN, Spain |
| IBERDROLA SA RESIGNED | Director | 29 Jul 1991 | 14 Dec 1995 | | | Apartado Correos 00119, Gardoqui 8, Bilbao, 48008, Spain |
| IBERDROLA SA RESIGNED | Director | | 27 Feb 1993 | | | Apartado Correos 00119, Gardoqui 8, Bilbao, 48008, Spain |
| INSTANT COMPANIES LIMITED RESIGNED | Nominee Director | 27 Feb 1991 | 09 Jul 1991 | | | 1, Mitchell Lane, Bristol, Avon, BS1 6BU |
| SWIFT INCORPORATIONS LIMITED RESIGNED | Nominee Director | 27 Feb 1991 | 27 Feb 1993 | | | 26, Church Street, London, NW8 8EP |