| ANDRICH, Victor James ACTIVE | Director | 30 Jan 2025 | | Australia | June 1959 | Chadwick Court, Chadwick Court, 15 Hatfields, London, United Kingdom, SE1 8DJ, United Kingdom |
| CVETKOVIC, Bruno, Dr ACTIVE | Director | 29 Sep 2023 | | Croatia | July 1979 | Chadwick Court, 15 Hatfields, London, SE1 8DJ |
| HANSEN, Henning Ivan ACTIVE | Director | 25 Jun 2024 | | Denmark | November 1963 | Chadwik Court, Chadwik Court, 15 Hatfield, London, United Kingdom, SE1 8DJ, United Kingdom |
| MATHIESON, Andrew ACTIVE | Director | 25 Sep 2019 | | Australia | July 1966 | 42, Pindari Crescent, Karabar, Queanbeyan, New South Wales 2620, Australia |
| MUSOKE, David, Dr ACTIVE | Director | 25 Jun 2024 | | Uganda | June 1984 | Chadwick Court, Chadwick Court, 15 Hatfields, London, United Kingdom, SE1 8DJ, United Kingdom |
| NEATHWAY, Casey Charles ACTIVE | Director | 01 Nov 2025 | | Canada | May 1982 | Chadwick Court, 15 Hatfields, London, SE1 8DJ |
| ALLAN, Linda Gertrude RESIGNED | Secretary | 13 Jan 1994 | 28 Feb 1995 | | | 77 Beaulieu Avenue, Sydenham, London, SE26 6PW |
| ANDRICH, Victor James RESIGNED | Secretary | 01 Jan 1999 | 27 Oct 2001 | | | Unit 4, 12 Axford Street, Como, Western Australia, 6158, Australia |
| BRADBURY, Robert Wayne RESIGNED | Secretary | 18 Jul 2018 | 21 Oct 2023 | | | 1884, Monteith Street, Victoria, British Columbia V8r 5x5, Canada |
| BRUNT, Terence James RESIGNED | Secretary | 01 Jan 1992 | 13 Jan 1994 | | | Chadwick House, 48 Rushworth Street, London, SE1 0RB |
| COOKE, Michael Ernest RESIGNED | Secretary | 28 Feb 1995 | 19 Jan 2000 | | | 127 Winchester Avenue, Leicester, Leicestershire, LE3 1AY |
| GODFREY, Anne RESIGNED | Secretary | 01 Jan 2016 | 13 Apr 2018 | | | Chadwick Court, 15 Hatfields, London, SE1 8DJ |
| JUKES, Graham Michael RESIGNED | Secretary | 17 Mar 2000 | 31 Dec 2015 | | | 52 Woodlands, Harrow, Middlesex, HA2 6EW |
| JUKES, Graham RESIGNED | Secretary | | 01 Jan 1992 | | | 16 Great Guildford Street, London, SE1 0HS |
| AL HARKAN, Ahmed Sulaiman RESIGNED | Director | 05 Jul 2014 | 13 Apr 2018 | Saudi Arabia | December 1960 | P.B. 1001, Roal Commission Jubail Industrial City, Jubail, Saudi Arabia 31961, Saudi Arabia |
| ARCHER, Peter John RESIGNED | Director | 01 Jan 2017 | 13 Apr 2018 | England | February 1945 | The Old Rectory, Astley, Stourport-On-Severn, Worcestershire, DY13 0RJ, England |
| BELL, Stephen John RESIGNED | Director | 01 Jan 2017 | 16 Apr 2020 | New Zealand | January 1955 | 11, Milton St, Trentham, Upper Hutt 5018, New Zealand |
| BLISS, Jesse Cole, Dr. RESIGNED | Director | 19 Jan 2021 | 30 Oct 2025 | United States | December 1976 | Chadwick Court, 15 Hatfields, London, SE1 8DJ |
| BRADBURY, Robert Wayne RESIGNED | Director | 11 Aug 2008 | 22 May 2012 | Canada | September 1948 | 1970, Daniel St, Trail, British Columbia, Canada |
| CHAKA, Jeremiah Sebetle RESIGNED | Director | 05 Jul 2014 | 19 Jan 2021 | South Africa | April 1962 | 198, First Avenue, Edenvale 1609, South Africa |
| CHAKA, Jeremiah Sebetle RESIGNED | Director | 29 Jul 2005 | 15 Jun 2006 | South Africa | April 1962 | 198 First Avenue, Edenvale, 1609, Republic Of South Africa |
| COOPER, Stephen James RESIGNED | Director | 01 Jan 2004 | 23 Mar 2020 | Northern Ireland | April 1951 | 23 Slieve Foy Place, Warrenpoint, County Down, BT34 3NR, N I |
| CVETKOVIC, Bruno RESIGNED | Director | 01 Jan 2018 | 25 Feb 2022 | Croatia | July 1979 | Hr-10000, Remetinecka Cesta 112a,, Zagreb, Croatia |
| DAVEY, Peter John, Dr RESIGNED | Director | 05 Sep 2010 | 06 May 2016 | Australia | March 1957 | Chadwick Court, 15 Hatfields, London, SE1 8DJ |
| ELLARD, Raymond RESIGNED | Director | 11 May 2008 | 25 Sep 2011 | Ireland | March 1955 | 17, Glendown Cres, Templeogue, Dublin, Ireland |
| FITZPATRICK, Martin RESIGNED | Director | 10 Apr 2019 | 19 Jun 2022 | Ireland | June 1962 | 17, Cabra Drive, Dublin 7, Ireland |
| FORTEATH, Bernard Jacques RESIGNED | Director | 05 Dec 2015 | 31 Dec 2017 | Scotland | June 1947 | 20, Taylor Avenue, Kilbarchan, Johnstone, Renfrewshire, PA10 2LS, Scotland |
| FORTEATH, Bernard Jacques RESIGNED | Director | 18 Jun 2006 | 05 Sep 2010 | Scotland | June 1947 | 20 Taylor Avenue, Kilbarchan, Johnstone, Renfrewshire, PA10 2LS |
| FOSKETT, Eric William RESIGNED | Director | 01 Jan 1994 | 01 Jan 1999 | | May 1920 | 26 Grebe Close, Poynton, Stockport, Cheshire, SK12 1HU |
| HALLS, Michael RESIGNED | Director | 01 Jan 1994 | 15 Jun 2006 | | December 1939 | Eastfield, 16 Abbotsford Road, Galashiels, Selkirkshire, TD1 3DS, Scotland |
| HANSEN, Henning RESIGNED | Director | 23 May 2012 | 06 May 2016 | Denmark | November 1963 | Testrupvej 167, Testrupvej 167, 8320 Maarslet, Denmark |
| HOMMA, Jan, Mr. RESIGNED | Director | 13 Apr 2022 | 25 Jun 2024 | Netherlands | January 1957 | 185, Koetsierbaan, 1315 Sn Almere, Netherlands |
| HOMMA, Jan RESIGNED | Director | 05 Jul 2014 | 05 Dec 2015 | Netherlands | January 1957 | 45, Trichtstraat, 1107 Pj Amsterdam, Netherlands |
| HOUSE, Roderick Douglas RESIGNED | Director | 23 May 2012 | 09 Apr 2019 | Scotland | August 1954 | 17, Kirkburn Avenue, Cambuslang, Glasgow, G72 8NT, Scotland |
| JONES, Brynley RESIGNED | Director | 27 Oct 2001 | 29 Jul 2005 | | January 1936 | 201 Llantarnam Road, Cwmbran, South Wales, NP44 3BG |
| JONES, Brynley RESIGNED | Director | 01 Jan 1994 | 01 Jan 1999 | | January 1936 | 24 Meyricks, Coed Eva, Cwmbran, Gwent, NP44 6TU |
| KANU, Christine Ekaete RESIGNED | Director | 24 Oct 2020 | 25 Feb 2022 | England | July 1977 | Chadwick Court, 15 Hatfields, London, SE1 8DJ |
| KNIGHT, Melton Wilburn RESIGNED | Director | 05 Jul 2014 | 30 Nov 2015 | Usa | May 1948 | 109, Gold Rock Court,, Folsom,, California , 95630-1841, Usa |
| MUDALY, Selvanathan RESIGNED | Director | 14 Sep 2016 | 25 Jun 2024 | South Africa | September 1952 | 68, Newport Avenue, Glenashley, Kwa-Zulu Natal 4051, South Africa |
| NEMAKONDE, Nkhumeleni David RESIGNED | Director | 22 Aug 2022 | 03 Mar 2026 | South Africa | April 1972 | Chardwick Court, 15 Hatfields, London, Hatfields, London, SE1 8DJ, England |
| OBRIEN, Frederick RESIGNED | Director | | 01 Jan 1994 | | May 1943 | 4 Roches Street, Limerick, IRISH, Republic Of Ireland |
| PAIXAO, Susana Monica Marinho, Professor RESIGNED | Director | 30 Apr 2018 | 22 Aug 2022 | Portugal | September 1974 | 139, Rua Do Museu 3045-096, Coimbra, Portugal |
| REGNER, Kia Tyrachristina Elisabet, Enviromental Health Chief Officer RESIGNED | Director | 01 Jan 1994 | 29 Jul 2005 | | July 1945 | Tallholmsvagen 5, S-185 94 Vaxholm, Sweden |
| SCARLETT, Henroy Perry, Dr RESIGNED | Director | 14 Sep 2016 | 25 Jun 2024 | Jamaica | July 1958 | Lot 1075 Gold Crescent, Mineral Heights, May Pen Po, Clarendon, Jamaica W 1 |
| SLEE, John RESIGNED | Director | 01 Jan 1999 | 27 Oct 2001 | | May 1947 | 10 Meadow Drive, Aughton, Ormskirk, Lancashire, L39 5BD |
| SMYTH, Colm RESIGNED | Director | 27 Jul 2005 | 11 May 2008 | | April 1961 | 2 Elmbrook Crescent, Lucan, County Dublin, IRISH, Ireland |
| WISPRIYONO, Bambang, Dr. RESIGNED | Director | 22 Dec 2020 | 13 Apr 2022 | Indonesia | August 1966 | Chadwick Court, 15 Hatfields, London, SE1 8DJ |