| KHATRI, Yogesh ACTIVE | Director | 24 Jun 2013 | | England | October 1965 | 216, Bath Road, Slough, Berkshire, SL1 4EN, England |
| PRICE, Steven Craig ACTIVE | Director | 19 Apr 2010 | | England | November 1969 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| REYNDERS, Nico Victor ACTIVE | Director | 01 Dec 2024 | | United Kingdom | August 1972 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| HARDY, Mark Glyn RESIGNED | Secretary | 29 Oct 2004 | 01 Oct 2023 | | | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| HARDY, Mark Glyn RESIGNED | Secretary | | 25 Jul 1996 | | | 2 Heathwood Close, Heath Road, Leighton Buzzard, Bedfordshire, LU7 3DU |
| MURPHY, John RESIGNED | Secretary | 25 Jul 1996 | 31 Jan 2001 | | | Pharmagene Laboratories Ltd, 2 Orchard Road, Royston, Herts, SG8 5HD |
| SLATER, John Andrew Duncan RESIGNED | Secretary | 31 Jan 2001 | 29 Oct 2004 | | | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| ALLEN, Peter Vance RESIGNED | Director | 31 Oct 2000 | 17 Dec 2004 | | March 1956 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| ANDO, Goran Albert Torstensson, Doctor RESIGNED | Director | 16 Apr 2003 | 29 Oct 2004 | | March 1949 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| ARNOLD, Stephen RESIGNED | Director | 08 Apr 2013 | 06 Apr 2015 | England | August 1969 | 216, Bath Road, Slough, Berkshire, SL1 4EN, England |
| BAINS, Harbinder Singh RESIGNED | Director | 13 Jan 2005 | 01 Feb 2006 | | June 1965 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| BATES, Malcolm Edwin RESIGNED | Director | | 31 May 2000 | | January 1948 | 273 Ashley Road, Hale, Altrincham, Cheshire, WA15 9NF |
| BLANCO, Hannah Victoria RESIGNED | Director | 16 Sep 2014 | 25 Sep 2015 | England | April 1980 | 216, Bath Road, Slough, Berkshire, SL1 4EN, England |
| BOGIE, William, Dr RESIGNED | Director | 01 Apr 1993 | 16 Mar 2000 | | August 1944 | 23 Andrews Way, Marlow Bottom, Buckinghamshire, SL7 3QJ |
| BRADING, Claire RESIGNED | Director | 01 Jan 2021 | 01 Dec 2024 | England | September 1981 | 216, Bath Road, Slough, Berkshire, SL1 4EN, England |
| BUFTON, Roland John Lewis RESIGNED | Director | | 06 Jul 1998 | | August 1948 | 5 The Uplands, Gerrards Cross, Buckinghamshire, SL9 7JQ |
| CARTMELL, Simon Christopher RESIGNED | Director | 31 Oct 2000 | 28 Jun 2002 | | January 1960 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| CNOPS, Willy Constant RESIGNED | Director | 12 Jan 2016 | 01 Dec 2019 | Belgium | June 1961 | 216, Bath Road, Slough, Berkshire, SL1 4EN, England |
| COOMBES, Dan RESIGNED | Director | 08 Oct 2018 | 01 Jan 2021 | United Kingdom | May 1975 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| COZENS, Peter John, Doctor RESIGNED | Director | 28 Sep 1994 | 31 Jul 2000 | | December 1951 | Whistlers Cottage, The Ridge, Woldingham, Surrey, CR3 7AN |
| D' HAMALE, Michele De Cannart RESIGNED | Director | 01 Jan 2008 | 01 Jul 2011 | Belgium | May 1951 | Rue Aux Laines, 21-100, Brussels, Belgium |
| DAMIEN, Vincent RESIGNED | Director | 01 Jan 2006 | 31 Dec 2009 | | April 1954 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| DOLIVEUX, Frederic Roch RESIGNED | Director | 13 Jan 2005 | 12 May 2005 | | November 1956 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| DUNCAN, Greg RESIGNED | Director | 30 Nov 2007 | 30 Apr 2009 | | January 1965 | 1a Hyacintenlaan, 1560 Hoeilaart, Belgium |
| FARGHER, Adina-Lee Rudston RESIGNED | Director | 21 May 2013 | 10 Feb 2017 | England | October 1979 | 216, Bath Road, Slough, Berkshire, SL1 4EN, England |
| FELLNER, Peter John, Dr RESIGNED | Director | 31 Oct 2000 | 16 Apr 2003 | | December 1943 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| FERGUSON, John RESIGNED | Director | | 06 Apr 2001 | | December 1955 | 184 Amyand Park Road, Twickenham, Middlesex, TW1 3HY |
| GERARD, William Wilson RESIGNED | Director | | 10 Dec 1993 | | August 1933 | 4 Harmer Dell, Harmer Green Lane Digswell, Welwyn, Hertfordshire, AL6 0BE |
| HARDY, Mark Glyn RESIGNED | Director | 25 Jul 1996 | 01 Oct 2023 | United Kingdom | June 1953 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| HARRIS, Ralph Stephen RESIGNED | Director | 28 Sep 1994 | 27 Apr 1995 | England | June 1942 | Old Tiles, Westwood Road, Windlesham, Surrey, GU20 6NB |
| HARRIS, Ralph Stephen RESIGNED | Director | | 10 Dec 1993 | | June 1942 | 22 Oast Road, Oxted, Surrey, RH8 9DU |
| HARVEY, Michael John RESIGNED | Director | | 31 Jan 2000 | | January 1950 | Pinmill 5 Howey Lane, Frodsham, Warrington, Cheshire, WA6 6AB |
| INFANTE GONZALEZ DE LA ALEJA, Ana Isabel RESIGNED | Director | 25 May 2022 | 01 Dec 2024 | Belgium | March 1970 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| IVERSEN, Bo Kjelgaard RESIGNED | Director | 01 Nov 2010 | 17 Mar 2016 | Belgium | May 1966 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| JONES, Stephen Charles RESIGNED | Director | 01 Feb 2006 | 30 Jun 2013 | United Kingdom | August 1952 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| KHOSO BALUCH, Mohammed Nazir RESIGNED | Director | 19 Apr 2010 | 12 Jan 2016 | Belgium | February 1958 | Avenue Louise 272, Bte2, Brussels, 1050, Belgium |
| LEES, David John RESIGNED | Director | | 10 Dec 1993 | | September 1947 | Larchwood, Heathfield Avenue Sunninghill, Ascot, Berkshire, SL5 0AL |
| LEWIS, Pamela Mary, Dr RESIGNED | Director | 09 May 1992 | 10 Dec 1993 | | April 1954 | 29 Burstock Road, Putney, London, SW15 2PW |
| LOOMAN, Simon RESIGNED | Director | 13 Jan 2005 | 31 Dec 2008 | | April 1947 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| LURQUIN, Michel RESIGNED | Director | 01 Oct 2005 | 31 Dec 2008 | | October 1944 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| MABON, George David RESIGNED | Director | 01 Nov 1992 | 31 Mar 1994 | | October 1948 | 11 St Christophers Close, Isleworth, Middlesex, TW7 4NP |
| MCDADE, Mark Daniel RESIGNED | Director | 30 Apr 2009 | 02 Apr 2012 | Belgium | May 1955 | Rue Du Pacifique, 34, Brussels, 1180, Belgium |
| MCHALE, Richard Michael RESIGNED | Director | 19 May 2008 | 30 Apr 2009 | | May 1964 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| MCHALE, Richard Michael RESIGNED | Director | 04 Dec 2003 | 01 Mar 2008 | | May 1964 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| MILLARD, Dennis Henry RESIGNED | Director | 30 Mar 1994 | 29 Feb 1996 | United Kingdom | February 1949 | Kingscote, Binfield Road, Wokingham, Berkshire, RG40 5PP |
| MOREAU, Jean-Luc RESIGNED | Director | 03 Nov 2014 | 30 Apr 2015 | France | January 1960 | 216, Bath Road, Slough, Berkshire, SL1 4EN, England |
| NICHOLLS, Peter Geoffrey RESIGNED | Director | 31 Jan 2005 | 02 Oct 2009 | England | June 1949 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| OLUWA, Olufunlayo Modupe RESIGNED | Director | 01 Jan 2024 | 01 Dec 2024 | United Kingdom | January 1968 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| REDRUP, Stephen John RESIGNED | Director | 04 Jul 1994 | 29 Feb 2000 | | March 1952 | White Chimneys 106 Chaveney Road, Quorn, Loughborough, Leicestershire, LE12 8AD |
| ROBINSON, William RESIGNED | Director | 12 May 2005 | 12 Dec 2007 | | February 1948 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| ROEDER, Stephan RESIGNED | Director | 30 Nov 2007 | 01 Sep 2008 | | December 1960 | 203 Wiemelhauser Strasse, 44799 Bochum, Germany |
| ROELANDT, Erik RESIGNED | Director | 01 Nov 2007 | 24 Jul 2010 | Belgium | July 1964 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| SAUNDERS, Ingelise RESIGNED | Director | 23 Jul 2002 | 14 Sep 2004 | | June 1949 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| SHEPPARD, Alan RESIGNED | Director | 01 Sep 1995 | 27 Aug 1999 | United Kingdom | November 1947 | 7 Kipings, Tadworth, Surrey, KT20 5TN |
| SPEERS, Matthew John Norton RESIGNED | Director | 01 Mar 2008 | 31 Dec 2012 | England | December 1958 | 216, Bath Road, Slough, Berkshire, SL1 4EN, United Kingdom |
| STRIGINI, Bruno RESIGNED | Director | 13 Jan 2005 | 01 Feb 2006 | | March 1961 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| TAYLOR, Bernard David RESIGNED | Director | | 10 Dec 1993 | | October 1935 | 33 Kensington Square, London, W8 5HH |
| TELLIER, Jean-Christophe Pierre RESIGNED | Director | 02 Apr 2012 | 03 Nov 2014 | Belgium | December 1959 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| TURLEY, Stephen RESIGNED | Director | 02 Nov 2015 | 08 Oct 2018 | England | July 1969 | 216, Bath Road, Slough, SL1 3WE, England |
| TURNER, Roger John Langdon RESIGNED | Director | | 30 Nov 1992 | | August 1948 | South Lodge, Taplow Common Road, Burnham, Buckinghamshire, SL1 8LP |
| UPCHURCH, Francis Charles, Dr RESIGNED | Director | 01 Sep 1997 | 05 Feb 2001 | | October 1950 | 93b Ambleside Road, Lightwater, Surrey, GU18 5UJ |
| VILLA, Ilaria RESIGNED | Director | 01 Dec 2019 | 20 May 2022 | Italy | March 1974 | 208 Bath Road, Slough, Berkshire, SL1 3WE |
| WATTS, Garry RESIGNED | Director | 29 Feb 1996 | 30 Sep 2000 | | December 1956 | Walters Farmhouse, Robertsbridge, East Sussex, TN32 5BH |
| WATY, Philippe RESIGNED | Director | 01 Jan 2008 | 30 Apr 2011 | Belgium | August 1963 | Allee De La Recherche 60, Brussels, B1070, Belgium |
| YOUNG, Michael, Dr RESIGNED | Director | 27 Jun 1995 | 08 Sep 2000 | | September 1939 | 654 Wallace Drive, Wayne, Pa 19087, Usa |