| DUNGATE, Paul ACTIVE | Secretary | 01 Apr 2026 | | | | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| GARDNER, Paul ACTIVE | Director | 30 Mar 2026 | | Ireland | April 1986 | Wm Haigh Grange Cottage, Fulham Lane, Womersley, Doncaster, DN6 9BW, England |
| GYSIN, Andrea ACTIVE | Director | 31 Jul 2024 | | England | June 1981 | Wm Haigh Grange Cottage, Fulham Lane, Womersley, Doncaster, DN6 9BW, England |
| LEWIS, Rachel Johanne ACTIVE | Director | 28 Jul 2022 | | England | March 1977 | Vox Studios, British Water, 1-45 Durham Street, London, SE11 5JH, England |
| NAR, Suresh ACTIVE | Director | 31 Jul 2024 | | England | December 1983 | Wm Haigh Grange Cottage, Fulham Lane, Womersley, Doncaster, DN6 9BW, England |
| PETROPOULOS, Evangelos ACTIVE | Director | 23 Mar 2026 | | United Kingdom | August 1982 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| SLESSOR, Stephen James ACTIVE | Director | 27 Jul 2023 | | Scotland | May 1976 | Wm Haigh Grange Cottage, Fulham Lane, Womersley, Doncaster, DN6 9BW, England |
| THOMPSON, Lila Ionie ACTIVE | Director | 14 Jun 2006 | | England | February 1969 | Wm Haigh Grange Cottage, Fulham Lane, Womersley, Doncaster, DN6 9BW, England |
| WATSON, Sally ACTIVE | Director | 31 Jul 2024 | | England | April 1969 | Wm Haigh Grange Cottage, Fulham Lane, Womersley, Doncaster, DN6 9BW, England |
| ANTRAM, Carline RESIGNED | Secretary | 16 Mar 2000 | 09 May 2002 | | | 6 Yule Close, Bricket Wood, St Albans, Hertfordshire, AL2 3XZ |
| KETLER, Bence RESIGNED | Secretary | 01 Jul 2014 | 19 Jun 2019 | | | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| NEIL GALLACHER, David RESIGNED | Secretary | 09 May 2002 | 30 Jun 2014 | | | 7 Worple Avenue, Wimbledon, London, SW19 4JQ |
| ALDRIDGE, John Leon RESIGNED | Director | 31 Mar 2000 | 09 Jun 2009 | | February 1946 | 7, Kemsley Chase, Farnham Royal, Buckinghamshire, SL2 3LU |
| ALLUM, Anthony Kenneth RESIGNED | Director | 22 Oct 2003 | 14 Jun 2006 | Uk | September 1942 | Bulldog Cottage, High Street Urchfont, Devizes, Wiltshire, SN10 4RP |
| ARMSTRONG, Bernard John RESIGNED | Director | 11 May 2006 | 23 Nov 2012 | England | September 1949 | 4, Lowerfold Drive, Rochdale, Lancashire, OL12 7JA |
| BALLARD, John Frederick RESIGNED | Director | 17 Dec 2003 | 14 Jun 2006 | | August 1943 | 81 Humber Road, London, SE3 7LR |
| BAYFIELD, Jeremy Paul RESIGNED | Director | 01 Jul 2014 | 30 Apr 2016 | England | May 1950 | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| BERNARD, Ian Richard Albert RESIGNED | Director | 30 Nov 2016 | 05 Dec 2018 | England | April 1951 | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| BLACKHALL, Andrew Connor RESIGNED | Director | 27 Feb 2020 | 28 Jul 2022 | Wales | March 1977 | Vox Studios, V124, 1-45 Durham Street,, Vauxhall, London, London, SE11 5JH, United Kingdom |
| BRENDISH, Kenneth Reginald RESIGNED | Director | 28 Feb 2005 | 10 Dec 2006 | | November 1937 | Haven Cottage, The Square, Shere, Surrey, GU5 9HG |
| BRESNAN, Paul James RESIGNED | Director | 06 Dec 2017 | 31 Jul 2024 | United Kingdom | August 1966 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| BUSH, Jonathan Paul RESIGNED | Director | 16 Jun 2004 | 19 Jan 2005 | England | July 1952 | 49 Langfield Road, Knowle, Solihull, West Midlands, B93 9PS |
| CARTER, James Patrick RESIGNED | Director | 25 Jun 2003 | 15 Jan 2014 | United Kingdom | October 1959 | 5 Elm Close, Witchford, Ely, Cambridgeshire, CB6 2JH |
| CHESHIRE, Stanley William George RESIGNED | Director | 13 Jun 2007 | 12 Jun 2008 | | May 1956 | 35 Warren Road, Hillmorton, Rugby, Warwickshire, CV22 5LQ |
| CLARK, Piers Benedict, Dr RESIGNED | Director | 23 Oct 2002 | 19 Mar 2003 | United Kingdom | November 1969 | 61 Downs Wood, Epsom Downs, Surrey, KT18 5UJ |
| CLEWS, Susan RESIGNED | Director | 11 May 2006 | 19 May 2014 | England | September 1955 | The Laurels, Shebdon, Stafford, Staffordshire, ST20 0PT |
| COATES, Mark RESIGNED | Director | 30 Mar 2026 | 27 Jul 2026 | England | November 1970 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| COATES, Mark RESIGNED | Director | 31 Jul 2024 | 06 Mar 2026 | England | November 1970 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| COATES, Mark RESIGNED | Director | 25 Feb 2021 | 27 Jul 2023 | England | November 1970 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| CONWAY, Anthony Jeremy RESIGNED | Director | 24 Feb 2016 | 24 Jul 2025 | England | April 1956 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| CURNOW, Stephen RESIGNED | Director | 31 Mar 2000 | 17 Dec 2003 | United Kingdom | April 1954 | Sunset Barn Cracoe, Skipton, North Yorkshire, BD23 6LB |
| ELPHICK, Andrew RESIGNED | Director | 31 Mar 2000 | 26 Jun 2002 | | June 1941 | Badgers Brook, Appledore, Kent, TN26 2BS |
| FLASCK, Tania RESIGNED | Director | 01 Apr 2020 | 31 Jul 2024 | England | July 1969 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| FLETCHER, Mark, Dr RESIGNED | Director | 27 Feb 2020 | 24 Jul 2025 | England | May 1965 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| FORD, Alan John RESIGNED | Director | 18 Sep 2013 | 22 Aug 2014 | England | July 1968 | Unit 2, Redfields Lane, Church Crookham, Fleet, Hampshire, GU52 0RJ, England |
| FOSTEN, Angus William RESIGNED | Director | 03 Dec 2020 | 28 Jul 2022 | England | August 1967 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| FOSTEN, Angus William RESIGNED | Director | 25 Sep 2018 | 01 Apr 2020 | England | August 1967 | Vox Studios, Unit V107, 1-45 Durham Street, London, SE11 5JH, England |
| FROOM, Michael John RESIGNED | Director | 27 Feb 2020 | 27 Jul 2026 | England | May 1965 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| FROOM, Michael John RESIGNED | Director | 05 Oct 2016 | 01 Dec 2018 | England | May 1965 | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| FROUD, Michael John RESIGNED | Director | 26 Jun 2002 | 10 Jun 2010 | England | December 1959 | Anglers Oast, Church Lane West Farleigh, Maidstone, Kent, ME15 0DT |
| GARDNER, Paul RESIGNED | Director | 31 Jul 2024 | 06 Mar 2026 | Ireland | April 1986 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| HARVEY, Peter John RESIGNED | Director | 19 Jan 2005 | 12 Jun 2007 | United Kingdom | October 1950 | 1 Dishley Court, Newtown, Leominster, Herefordshire, HR6 8QD |
| HAYES, Colin Raymond, Dr RESIGNED | Director | 25 Jun 2003 | 12 Jun 2007 | Wales | April 1950 | Gelli Doc, Llannon, Llanelli, Dyfed, SA14 6AR |
| HAYWARD, Keith William RESIGNED | Director | 27 Sep 2017 | 28 Feb 2019 | Wales | October 1959 | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| HENDERSON, Nicola Ann RESIGNED | Director | 27 Nov 2013 | 30 Nov 2016 | England | August 1968 | Wentworth Business Park, Maple Road, Tankersley, Barnsley, South Yorkshire, S75 3DL, England |
| HERBATH, Yolande Frances Elizabeth, Dr RESIGNED | Director | 16 Feb 2011 | 03 Apr 2014 | England | October 1966 | The Fluid Engineering Centre, College Road, Wharley End, Cranfield, Bedford, MK43 0AJ, United Kingdom |
| HORROCKS, Lee Craige RESIGNED | Director | 12 Jun 2009 | 07 Jul 2020 | England | August 1961 | Vox Studios, Unit V107, 1-45 Durham Street, London, SE11 5JH, England |
| KANER, David Anthony, Dr RESIGNED | Director | 20 Mar 2002 | 18 Jun 2019 | England | January 1957 | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| KANER, David Anthony, Dr RESIGNED | Director | 31 Mar 2000 | 09 Oct 2001 | | January 1957 | The Granary, Stockton, Worcester, Worcestershire, WR6 6UT |
| KETLER, Bence RESIGNED | Director | 01 Jul 2014 | 19 Jun 2019 | England | September 1982 | Vox Studios, Unit V107, 1-45 Durham Street, London, SE11 5JH, England |
| LANE, Mark Alastair RESIGNED | Director | 16 Mar 2013 | 17 Jun 2015 | England | March 1950 | 30, Crown Place, London, EC2A 4ES, England |
| LLOYD, Robert Alexander RESIGNED | Director | 14 Jun 2006 | 31 Jul 2007 | England | February 1963 | 1 Butt Lane, Blackfordby, Swadlincote, Derbyshire, DE11 8BG |
| LOUGHLIN, Christopher RESIGNED | Director | 11 May 2016 | 28 Jul 2022 | England | August 1952 | Vox Studios, V124, 1-45 Durham Street,, Vauxhall, London, London, SE11 5JH, United Kingdom |
| MARSH, Peter RESIGNED | Director | 09 May 2002 | 06 Feb 2006 | United Kingdom | November 1948 | 120 Drove Road, Biggleswade, Bedfordshire, SG18 0HJ |
| MARTIN, John Roger RESIGNED | Director | 14 Jun 2000 | 25 Oct 2000 | England | November 1940 | Meridian, Old Hall Lane, Lubenham, Market Harborough, Leicestershire, LE16 9TJ |
| MARTIN, Lloyd RESIGNED | Director | 03 Apr 2014 | 31 Jan 2019 | England | October 1954 | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| MERLANE, Catherine Nicole RESIGNED | Director | 16 Apr 2012 | 20 May 2015 | United Kingdom | July 1962 | Elms House, 33 Brook Green, London, W6 7EF, United Kingdom |
| MILES, Derek William James, Dr RESIGNED | Director | 31 Mar 2000 | 14 Jun 2000 | England | July 1937 | 27 Charleston Court West Cliff Road, Broadstairs, Kent, CT10 1RY |
| MOSELEY, Alastair John RESIGNED | Director | 24 Sep 2014 | 15 Jun 2016 | England | February 1960 | 7, Penshurst Road, Bromsgrove, Worcestershire, B60 2SL, England |
| MULLORD, Paul Montague RESIGNED | Director | 14 Jun 2006 | 25 Sep 2020 | England | November 1956 | Vox Studios, Unit V107, 1-45 Durham Street, London, SE11 5JH, England |
| NEIL GALLACHER, David RESIGNED | Director | 16 Mar 2000 | 14 Aug 2018 | England | March 1939 | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| PALLETT, Ian Henry, Dr RESIGNED | Director | 14 Jun 2006 | 10 Jun 2009 | | March 1944 | 9 The Glebe Church Road, Copthorne, Crawley, West Sussex, RH10 3RP |
| PEREZ ORTOLA, Marta RESIGNED | Director | 24 Feb 2016 | 30 Nov 2017 | England | September 1986 | Vox Studios, Unit V103, 1-45 Durham Street, London, SE11 5JH, England |
| PERFECT, Henry George RESIGNED | Director | 31 Mar 2000 | 26 Jun 2002 | Scotland | March 1944 | 15 Thorn Road, Bearsden, Glasgow, G61 4BS |
| PETROPOULOS, Evangelos RESIGNED | Director | 24 Jul 2025 | 06 Mar 2026 | United Kingdom | August 1982 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| PIANO, Edoardo RESIGNED | Director | 27 Jul 2023 | 27 Jul 2026 | England | April 1980 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| PRICE, Frank Ronald RESIGNED | Director | 08 Dec 2010 | 31 Aug 2012 | United Kingdom | July 1955 | Grontmij Grove House, Mansion Gate Drive, Leeds, LS7 4DN, England |
| RANDLES, Nicola Josephine RESIGNED | Director | 16 Mar 2013 | 12 Jun 2013 | England | December 1960 | Andritz Ltd., Speedwell Road, Parkhouse Industrial Estate East, Newcastle, Staffordshire, ST5 7RG, England |
| ROE, Ashley Edwin RESIGNED | Director | 31 Mar 2000 | 30 Apr 2016 | England | February 1951 | The White House, Clifton, Ashbourne, Derbyshire, DE6 2GL |
| SPENCER, Robert John RESIGNED | Director | 09 May 2002 | 16 Jun 2004 | | March 1949 | Hillcrest House, Hillcrest Waye, Gerrards Cross, Buckinghamshire, SL9 8DN |
| STEPHENSON, Alex Gordon RESIGNED | Director | 05 Dec 2018 | 03 Dec 2020 | United Kingdom | January 1959 | Vox Studios, V124, 1-45 Durham Street,, Vauxhall, London, London, SE11 5JH, United Kingdom |
| STEPHENSON, Thomas, Professor RESIGNED | Director | 10 Jun 2010 | 01 Oct 2014 | United Kingdom | November 1957 | Southbank House, Black Prince Road, London, SE1 7SJ, England |
| STEPHENSON, Thomas, Professor RESIGNED | Director | 14 Jun 2000 | 16 Jun 2005 | United Kingdom | November 1957 | Evergreens, Bourne End Road, Cranfield, Bedfordshire, MK43 0BD |
| STEVENS, Shaun RESIGNED | Director | 01 Apr 2020 | 28 Jul 2022 | England | May 1972 | Vox Studios, V124, 1-45 Durham Street,, Vauxhall, London, London, SE11 5JH, United Kingdom |
| THE RIGHT HONOURABLE THE VISCOUNT WEIR, Viscount RESIGNED | Director | 31 Mar 2000 | 14 Jun 2000 | | November 1933 | Rodinghead, Mauchline, Ayrshire, KA5 5TR |
| TILLIER, Raymond John RESIGNED | Director | 23 Nov 2012 | 18 Sep 2013 | England | September 1948 | Southbank House, Black Prince Road, London, SE1 7SJ, England |
| TOMLINSON, Frank Ivor RESIGNED | Director | 25 Oct 2000 | 15 Nov 2004 | | August 1941 | 36 White Gables, White House Way, Solihull, West Midlands, B91 1SE |
| TURTLE, Trevor William RESIGNED | Director | 16 Mar 2000 | 22 Aug 2012 | England | July 1952 | 1st Floor Exchange House, Primrose Street, London, EC2A 2HS |
| WALLACE, Andrew James Angus RESIGNED | Director | 10 May 2017 | 27 Feb 2020 | England | May 1979 | Vox Studios, Unit V107, 1-45 Durham Street, London, SE11 5JH, England |
| WEBBER, Stephen Frederick John RESIGNED | Director | 24 Sep 2014 | 04 Oct 2016 | England | September 1958 | 12, Charlesworth Park, Haywards Heath, West Sussex, RH16 3JG, England |
| WEBBER, Steve RESIGNED | Director | 04 Dec 2019 | 25 Feb 2021 | England | September 1958 | Vox Studios, V124, 1-45 Durham Street,, Vauxhall, London, London, SE11 5JH, United Kingdom |
| WHITTINGHAM, David RESIGNED | Director | 31 Mar 2000 | 19 Nov 2001 | | April 1944 | Fairhaven, Knutsford Road, Mobberley, Cheshire, WA16 7BE |
| WILDGOOSE, Duncan RESIGNED | Director | 12 Jun 2008 | 09 Jun 2009 | England | July 1965 | 35, Leighton Road, Uttoxeter, Staffordshire, ST14 8BL, United Kingdom |
| WILLIAMS, Anthony Vernon RESIGNED | Director | 27 Jun 2001 | 07 Jul 2020 | England | June 1960 | Vox Studios, Unit V107, 1-45 Durham Street, London, SE11 5JH, England |
| WILLIAMS, Christopher Alan RESIGNED | Director | 01 Aug 2007 | 28 Oct 2009 | England | April 1967 | Anchor Lodge, 33 Highdale Avenue, Clevedon, Somerset, BS21 7LS |
| WILLIAMS, Tom RESIGNED | Director | 28 Jul 2022 | 31 Jul 2024 | England | May 1975 | Vox Studios, British Water, 1-45 Durham Street, London, SE11 5JH, England |
| WILLIS, Michael Trevor RESIGNED | Director | 23 Nov 2012 | 07 Jul 2020 | United Kingdom | July 1962 | Vox Studios, Unit V107, 1-45 Durham Street, London, SE11 5JH, England |
| WILLIS, Michael Trevor RESIGNED | Director | 08 Dec 2010 | 23 Nov 2012 | United Kingdom | July 1962 | Mwh Treatment, Gregge Street, Heywood, Lancashire, OL10 2DX, United Kingdom |
| WILLISON, Toby William, Dr RESIGNED | Director | 23 May 2019 | 24 Jul 2025 | England | March 1965 | Vox Studios V124, 1-45 Durham Street, Vauxhall, London, SE11 5JH, England |
| YOUINGS, John RESIGNED | Director | 23 Oct 2002 | 16 Jun 2004 | United Kingdom | January 1943 | Yew Tree House Princess Hill, Redlynch, Salisbury, Wiltshire, SP5 2HG |