| BERNSAND, Charlotta Sofia ACTIVE | Secretary | 18 Nov 2022 | | | | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| BYRNE, David ACTIVE | Secretary | 23 Jun 2022 | | | | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| AUER, Liam Patrick ACTIVE | Director | 06 Jan 2025 | | United Kingdom | May 1989 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| BUTTERWORTH, Jonathan ACTIVE | Director | 01 May 2021 | | England | June 1962 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| DALVAI, Anita ACTIVE | Director | 16 Jul 2026 | | United Kingdom | December 1987 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| DELA CRUZ, Jenny Lyn ACTIVE | Director | 29 Jan 2024 | | England | December 1990 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| DIVOKY, Jerry James ACTIVE | Director | 31 Jan 2023 | | Canada | August 1966 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| HIGGINS, Howard Charles ACTIVE | Director | 31 Jan 2023 | | United Kingdom | March 1953 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| HOOPER, Nick ACTIVE | Director | 01 Aug 2021 | | England | December 1975 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| PRICE, William David George ACTIVE | Director | 04 Sep 2026 | | England | September 1984 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| ROSS, Cathryn ACTIVE | Director | 21 Jun 2019 | | United Kingdom | April 1972 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| RUSSELL, Mark Francis ACTIVE | Director | 01 Jul 2024 | | England | May 1960 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| WATSON, Robin ACTIVE | Director | 05 Feb 2025 | | United Kingdom | February 1967 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| BURNS, Clive RESIGNED | Secretary | 12 Sep 2014 | 11 Feb 2015 | | | 1-3 Strand, London, WC2N 5EH |
| CLAYTON, Karen Ann RESIGNED | Secretary | 10 Sep 2009 | 12 Sep 2014 | | | 1-3 Strand, London, WC2N 5EH |
| DAVIDSON, Rachael Jennifer RESIGNED | Secretary | 11 Feb 2015 | 28 Mar 2018 | | | 1-3 Strand, London, WC2N 5EH |
| GOODBAN, Derek John RESIGNED | Secretary | 07 Feb 2019 | 05 Nov 2021 | | | 1-3 Strand, London, WC2N 5EH |
| HAGAN, Lawrence RESIGNED | Secretary | 07 Feb 2018 | 18 Nov 2022 | | | 1-3 Strand, London, WC2N 5EH |
| JACKSON, John Henry RESIGNED | Secretary | | 12 Feb 1997 | | | 152 Grosvenor Road, London, SW1V 3JL |
| KAY, Alison Barbara RESIGNED | Secretary | 12 Sep 2014 | 11 Feb 2015 | | | 1-3 Strand, London, WC2N 5EH |
| KAY, Alison Barbara RESIGNED | Secretary | 21 Oct 2002 | 18 Feb 2008 | | | The Old Forge, Church Lane, Bearley, Stratford, CV37 0SL |
| MAHY, Helen Margaret RESIGNED | Secretary | 18 Feb 2008 | 10 Sep 2009 | | | Jincox Farm, Popes Lane, Oxted, Surrey, RH8 9PL |
| MAHY, Helen Margaret RESIGNED | Secretary | 31 Mar 2002 | 21 Oct 2002 | | | Cloche Merle Merle Common Road, Merle Common, Oxted, Surrey, RH8 0RP |
| MUNSEY, Jonathan Ross RESIGNED | Secretary | 21 Sep 2010 | 22 May 2012 | | | 1-3 Strand, London, WC2N 5EH |
| PATIENCE, Donald William John RESIGNED | Secretary | 12 Feb 1997 | 31 Mar 2002 | | | Burnside Little Ann, Abbotts Ann, Andover, Hampshire, SP11 7NW |
| TOMLINSON, Mark RESIGNED | Secretary | 05 Nov 2021 | 19 May 2022 | | | 1-3 Strand, London, WC2N 5EH |
| AGG, Andrew Jonathan RESIGNED | Director | 01 Jun 2013 | 13 Apr 2018 | England | October 1969 | 1-3 Strand, London, WC2N 5EH |
| AGOUMI, Mia RESIGNED | Director | 31 Jan 2023 | 11 Mar 2024 | United Kingdom | March 1985 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| AINGER, Stephen David RESIGNED | Director | 13 Dec 1999 | 12 Nov 2001 | England | November 1951 | 8, Downshire Hill, Hampstead, London, NW3 1NR |
| ALLSOPP, Julian Peter RESIGNED | Director | 01 Jun 2013 | 01 Oct 2016 | United Kingdom | March 1971 | 1-3 Strand, London, WC2N 5EH |
| BELL, Catherine Elisabeth Dorcas, Dr RESIGNED | Director | 01 Apr 2014 | 21 Jun 2019 | United Kingdom | April 1951 | 1-3 Strand, London, WC2N 5EH |
| BENDING, Jeremy Brice RESIGNED | Director | 17 Sep 2012 | 01 Jul 2013 | United Kingdom | July 1955 | 1-3 Strand, London, WC2N 5EH |
| BENNETT, Christopher Paul RESIGNED | Director | 25 Jun 2016 | 10 Sep 2021 | England | June 1971 | 1-3, Strand, London, WC2N 5EH, United Kingdom |
| BENSON, David Holford RESIGNED | Director | | 13 Dec 1999 | United Kingdom | February 1938 | 11 Brunswick Gardens, London, W8 4AS |
| BLACKER, Norman RESIGNED | Director | | 10 Nov 1995 | | May 1938 | 51 Waterside Point, Anhalt Road, London, SW11 4PD |
| BOISSIER, Roger Humphrey RESIGNED | Director | | 30 Apr 1996 | England | June 1930 | Easton House The Pastures, Repton, Derby, Derbyshire, DE65 6GG |
| BOLT, Christopher Wesley RESIGNED | Director | 13 Dec 1999 | 21 Oct 2002 | | October 1953 | 17 Charwelton Drive, Rugby, Warwickshire, CV21 1TU |
| BRANDON, Stephen John RESIGNED | Director | 14 Aug 1995 | 13 Dec 1999 | | June 1947 | Grove House, 19 Grove Road, Beaconsfield, Buckinghamshire, HP9 1UR |
| BROWN, Cedric Harold RESIGNED | Director | | 30 Apr 1996 | | March 1935 | Chesterton, 9c Ellwood Road, Beaconsfield, Buckinghamshire, HP9 1EN |
| BUCK, Colin RESIGNED | Director | 21 Oct 2002 | 30 Jun 2006 | England | August 1949 | 8 Northumberland Road, Leamington Spa, Warwickshire, CV32 6HA |
| BURRARD-LUCAS, Stephen Charles RESIGNED | Director | 13 Dec 1999 | 27 Jun 2007 | United Kingdom | April 1954 | 50 The Rise, Sevenoaks, Kent, TN13 1RL |
| CALVIOU, Michael Colin RESIGNED | Director | 01 Oct 2014 | 24 Sep 2015 | United Kingdom | March 1969 | 1-3 Strand, London, WC2N 5EH |
| CHAPMAN, Andrew Brian RESIGNED | Director | 27 Jun 2007 | 07 Jul 2008 | | October 1956 | Brook House, Brookside Lane, Badby, Northamptonshire, NN11 3AU |
| CHAPMAN, Frank Joseph RESIGNED | Director | 17 Feb 1997 | 13 Dec 1999 | | June 1953 | Marden House, Beech Drive, Kingswood, Surrey, KT20 6PP |
| CHILDS, Dawn Elizabeth RESIGNED | Director | 10 Dec 2019 | 31 May 2021 | United Kingdom | November 1970 | 1-3 Strand, London, WC2N 5EH |
| COLES, Arthur John, Sir RESIGNED | Director | 01 Mar 1998 | 13 Dec 1999 | | November 1937 | Flat 4 Beechwood, Iffley Turn, Oxford, OX4 4HW |
| COOPER, Malcolm Charles RESIGNED | Director | 27 Jun 2007 | 01 Jan 2016 | United Kingdom | June 1959 | 1-3 Strand, London, WC2N 5EH |
| COOPER, Malcolm Charles RESIGNED | Director | 13 Dec 1999 | 23 Oct 2000 | United Kingdom | June 1959 | 5 Dukes Avenue, Finchley, London, N3 2DE |
| DALTON, Howard William RESIGNED | Director | | 31 Dec 1995 | | May 1934 | Osprey House Friary Hall, Friary Road, Ascot, Berkshire, SL5 9HD |
| DICKIE, Kylee Marie RESIGNED | Director | 31 Jan 2023 | 11 Mar 2024 | United Kingdom | June 1981 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| EILLEDGE, Elwyn Owen Morris RESIGNED | Director | 17 Feb 1997 | 13 Dec 1999 | | July 1935 | Whitethorn House Long Grove, Seer Green, Beaconsfield, Buckinghamshire, HP9 2QH |
| ELPHICK, Clive Harry, Dr RESIGNED | Director | 01 Apr 2014 | 31 Jan 2023 | England | November 1956 | 1-3 Strand, London, WC2N 5EH |
| EVANS, Robert RESIGNED | Director | | 31 Dec 1993 | | May 1927 | 100 Rochester Row, London, SW1P 1JP |
| FAIRBAIRN, Mark Robert RESIGNED | Director | 01 Jun 2003 | 25 Mar 2011 | England | November 1958 | 1-3 Strand, London, WC2N 5EH |
| FARKAS, David RESIGNED | Director | 21 Oct 2024 | 28 Feb 2025 | England | October 1975 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| FITZGERALD, Emma RESIGNED | Director | 01 Jul 2013 | 30 Apr 2015 | England | January 1967 | 1-3 Strand, London, WC2N 5EH |
| FOSTER, Alan Peter RESIGNED | Director | 01 Jan 2016 | 21 Jul 2020 | United Kingdom | March 1971 | 1-3 Strand, London, WC2N 5EH |
| FRIEDRICH, William Michael RESIGNED | Director | 13 Dec 1999 | 31 Jul 2000 | | January 1949 | Eagle House, 108-110 Jermyn Street, London, SW1Y 6RP |
| GARDNER, Roy Alan, Sir RESIGNED | Director | 14 Nov 1994 | 17 Feb 1997 | | August 1945 | Old Hall Farm,Gill Hill, Markyate, St Albans, Hertfordshire, AL3 8AR |
| GIORDANO, Richard Vincent RESIGNED | Director | 01 Dec 1993 | 13 Dec 1999 | | March 1934 | 15 Astell Street, London, SW3 3RT |
| HAMPSON, Christopher RESIGNED | Director | 09 Oct 1997 | 13 Dec 1999 | United Kingdom | September 1931 | 77 Kensington Court, London, W8 5DT |
| HAMPTON, Philip Roy RESIGNED | Director | 25 Jul 1996 | 23 Oct 2000 | | October 1953 | Blakeney, Pennymead Rise, East Horsley, Leatherhead, Surrey, KT24 5AL |
| HERBERT, Russell RESIGNED | Director | | 16 Oct 1995 | | April 1944 | Quorndon, Newlands Drive, Maidenhead, Berkshire, SL6 4LL |
| HOLLIDAY, Steven John RESIGNED | Director | 21 Oct 2002 | 27 Jun 2007 | United Kingdom | October 1956 | Waterside House, 35 North Wharf Road, London, W2 1NW |
| HUMPHREYS, Stuart Calvin RESIGNED | Director | 07 Jul 2008 | 31 May 2013 | England | February 1963 | 1-3 Strand, London, WC2N 5EH |
| HUMPHRIES-NEW, Natalie RESIGNED | Director | 31 Jan 2023 | 26 Sep 2024 | England | February 1975 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| JONES, Eric Paul RESIGNED | Director | 13 Dec 1999 | 23 Oct 2000 | | March 1948 | Tarbay Farmhouse, Tarbay Lane Oakley Green, Windsor, Berkshire, SL4 4QG |
| KALMS, Harold Stanley, Lord RESIGNED | Director | | 17 Feb 1997 | United Kingdom | November 1931 | Flat 4, 24 St James's Place, London, SW1A 1NH |
| KEELING, Timothy RESIGNED | Director | 04 Mar 2023 | 30 Nov 2023 | Canada | September 1985 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| KELLY, Rhian Catriona RESIGNED | Director | 31 Jan 2023 | 11 Mar 2024 | United Kingdom | December 1976 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| LE FEVRE, Christopher Nelson RESIGNED | Director | 13 Dec 1999 | 15 Jan 2002 | United Kingdom | April 1953 | Craigellachie, Hinksey Hill, Oxford, Oxfordshire, OX1 5BQ |
| LEWIS, Alexandra Morton RESIGNED | Director | 13 Apr 2018 | 31 Jan 2023 | England | January 1972 | 1-3 Strand, London, WC2N 5EH |
| MACKRELL, Keith Ashley Victor RESIGNED | Director | 13 Jun 1994 | 13 Dec 1999 | United Kingdom | October 1932 | 34 Inner Park Road, Wimbledon, London, SW19 6DD |
| MANN, Patricia Kathleen Randall RESIGNED | Director | 11 Dec 1995 | 17 Feb 1997 | | September 1937 | 269 Lonsdale Road, Barnes, London, SW13 9QL |
| MATHIESON, Mark William RESIGNED | Director | 31 Jan 2023 | 15 May 2026 | England | September 1966 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| MATTHEWS, Colin Stephen RESIGNED | Director | 12 Nov 2001 | 20 Oct 2002 | United Kingdom | April 1956 | Brae Cottage Bute Avenue, Richmond, Surrey, TW10 7AX |
| MOULSON, Roger Harry RESIGNED | Director | 01 Jan 1996 | 12 Nov 1996 | | January 1944 | Sedgecombe House, Broad Campden, Chipping Campden, Gloucestershire, GL55 6UX |
| MURRAY, Christopher John RESIGNED | Director | 11 Feb 2016 | 27 Jul 2016 | England | April 1956 | 1-3 Strand, London, WC2N 5EH |
| MURRAY, Christopher John RESIGNED | Director | 01 Jun 2005 | 27 Jun 2007 | United Kingdom | April 1956 | Fairhaven, 10 Prestwick Close Tytherington, Macclesfield, Cheshire, SK10 2TH |
| NOLAN, Philip Michael Gerard RESIGNED | Director | 31 Jan 2023 | 31 Dec 2025 | Ireland | October 1953 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| NOLAN, Philip, Doctor RESIGNED | Director | 01 Jul 1998 | 31 Dec 2001 | | October 1953 | Fernside, Killiney Hill Road, Killiney, County Dublin, Republic Of Ireland |
| O'HARA, Cordelia RESIGNED | Director | 24 Sep 2015 | 16 Jul 2017 | United Kingdom | March 1974 | 1-3 Strand, London, WC2N 5EH |
| O'SULLIVAN, James Christopher RESIGNED | Director | 21 Oct 2002 | 31 Jul 2005 | United Kingdom | May 1959 | 187 Longdon Road, Knowle, Solihull, West Midlands, B93 9HY |
| PARKER, Thomas John, Sir RESIGNED | Director | 17 Feb 1997 | 13 Dec 1999 | Great Britain | April 1942 | Apt 29 Westfield, 15 Kidderpore Avenue, Hampstead London, NW3 7SF |
| PERRY, Michael Sydney, Sir RESIGNED | Director | 13 Jun 1994 | 17 Feb 1997 | | February 1934 | Flat 3, 35 Queens Gate Gardens, London, SW7 5RR |
| PETTIGREW, John Mark RESIGNED | Director | 01 Apr 2011 | 11 Feb 2016 | United Kingdom | October 1968 | 1-3 Strand, London, WC2N 5EH |
| PHAM, Nghi Do Truong RESIGNED | Director | 04 Mar 2023 | 21 Jul 2023 | Canada | September 1977 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| PLATT, Beryl Catherine, The Baroness Platt Of Writtle RESIGNED | Director | | 31 Dec 1994 | | April 1923 | Greenbury House, 46 Writtle Green, Chelmsford, Essex, CM1 3DU |
| PRICE, William David George RESIGNED | Director | 31 Jan 2023 | 15 May 2026 | England | September 1984 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| PROBERT, William Ronald RESIGNED | Director | | 30 Jun 1993 | | August 1934 | Cintra 32 Austenway, Gerrards Cross, Buckinghamshire, SL9 8NW |
| PULLEN, Neil James RESIGNED | Director | 01 Oct 2014 | 25 Sep 2015 | United Kingdom | April 1969 | 1-3 Strand, London, WC2N 5EH |
| QURESHI, Abdul Moiz RESIGNED | Director | 21 Jul 2023 | 16 Jul 2026 | England | August 1986 | National Grid House, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DA |
| REES, David Rocyn RESIGNED | Director | 12 Nov 2001 | 21 Oct 2002 | | April 1959 | Linden Lodge, Hunningham, Leamington Spa, Warwickshire, CV33 9DR |
| RIMINGTON, Stella, Dame RESIGNED | Director | 17 Feb 1997 | 13 Dec 1999 | | May 1935 | Flat 1 27 Baker Street, London, W1M 2AE |
| RIPLEY, Mark Guy RESIGNED | Director | 01 Oct 2014 | 24 Jun 2016 | United Kingdom | February 1965 | 1-3 Strand, London, WC2N 5EH |
| ROGERSON, Philip Graham RESIGNED | Director | | 20 Feb 1998 | | January 1945 | 56 Vogans Mill, Mill Street, London, SE1 2BZ |
| SHAW, Lucy Nicola RESIGNED | Director | 27 Jul 2016 | 05 Nov 2021 | England | May 1969 | 1-3 Strand, London, WC2N 5EH |
| SHEPPARD, Philip Graham RESIGNED | Director | 17 Jul 2017 | 01 May 2021 | United Kingdom | May 1964 | 1-3 Strand, London, WC2N 5EH |
| SLYE, Fintan Charles RESIGNED | Director | 07 Feb 2018 | 01 Jan 2020 | England | March 1970 | 1-3 Strand, London, WC2N 5EH |
| TODD, Alistair Mark RESIGNED | Director | 30 Apr 2020 | 01 Aug 2021 | United Kingdom | November 1975 | 1-3 Strand, London, WC2N 5EH |