| LIAWATIDEWI, Jacob ACTIVE | Secretary | 01 Sep 2016 | | | | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| VISTRA COMPANY SECRETARIES LIMITED ACTIVE | Secretary | 28 Jul 2016 | | | | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| PETERS, William ACTIVE | Director | 28 Jul 2016 | | United States | August 1967 | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| FRANZONE, Helen RESIGNED | Secretary | 03 Jun 1991 | 01 Nov 1991 | | | 1845 N Raymond Avenue, Pasadena Ca 91103 |
| HARDY, Mark Glyn RESIGNED | Secretary | 29 Oct 2004 | 28 Jul 2016 | | | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| HARDY, Mark Glyn RESIGNED | Secretary | 06 Oct 1992 | 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 |
| BAINS, Harbinder Singh RESIGNED | Director | 17 Dec 2004 | 28 Feb 2006 | | June 1965 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| BOZMAN, Joseph RESIGNED | Director | 16 Jun 1993 | 03 Apr 1995 | | September 1945 | 2409 Dehart Farm Road, Glencoe, Usa, FOREIGN, Usa |
| CARTMELL, Simon Christopher RESIGNED | Director | 31 Oct 2000 | 28 Jun 2002 | | January 1960 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| FERGUSON, John RESIGNED | Director | 10 Dec 1993 | 24 May 2001 | | December 1955 | 184 Amyand Park Road, Twickenham, Middlesex, TW1 3HY |
| GERARD, William Wilson RESIGNED | Director | 06 Oct 1992 | 31 Dec 1994 | | August 1933 | 4 Harmer Dell, Harmer Green Lane Digswell, Welwyn, Hertfordshire, AL6 0BE |
| GOWRIE-SMITH, Ian Roderick RESIGNED | Director | 16 Jun 1993 | 24 Sep 1993 | | June 1948 | 16 Chelsea Square, London, SW3 6LF |
| HARDY, Mark Glyn RESIGNED | Director | 25 Jul 1996 | 28 Jul 2016 | United Kingdom | June 1953 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| JONES, Stephen Charles RESIGNED | Director | 28 Feb 2006 | 30 Jun 2013 | United Kingdom | August 1952 | 216 Bath Road, Slough, Berkshire, SL1 4EN |
| KHATRI, Yogesh RESIGNED | Director | 24 Jun 2013 | 28 Jul 2016 | United Kingdom | October 1965 | 216, Bath Road, Slough, Berkshire, SL1 4EN, England |
| LEES, David John RESIGNED | Director | 16 Jun 1993 | 26 Apr 1994 | | September 1947 | Larchwood, Heathfield Avenue Sunninghill, Ascot, Berkshire, SL5 0AL |
| LIAWATIDEWI, Jacob RESIGNED | Director | 28 Jul 2016 | 10 Aug 2026 | United States | March 1974 | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| LUO, Mary RESIGNED | Director | 28 Jul 2016 | 10 Aug 2026 | United States | July 1949 | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| MILLARD, Dennis Henry RESIGNED | Director | 26 Apr 1994 | 29 Feb 1996 | United Kingdom | February 1949 | Kingscote, Binfield Road, Wokingham, Berkshire, RG40 5PP |
| REDRUP, Stephen John RESIGNED | Director | 26 Sep 1996 | 29 Feb 2000 | | March 1952 | White Chimneys 106 Chaveney Road, Quorn, Loughborough, Leicestershire, LE12 8AD |
| SCHWALLIE, Gary Lee RESIGNED | Director | | 25 May 1993 | | August 1948 | 25682 Cresta Loma, Laguna Niguel, California Ca 92677, FOREIGN, Usa |
| SHANDELL, Jason RESIGNED | Director | 28 Jul 2016 | 20 Apr 2020 | United States | January 1974 | First Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |
| SWARTWOOD, Randolph RESIGNED | Director | 03 Jun 1991 | 25 May 1993 | | October 1954 | 20 Benjamin, Irvine Ca 92720 |
| WALL, Randall Jay RESIGNED | Director | | 25 May 1993 | | July 1946 | 3403 Grand Avenue, Claremont, California Ca91711, FOREIGN, Usa |
| WATTS, Garry RESIGNED | Director | 29 Feb 1996 | 30 Sep 2000 | | December 1956 | Walters Farmhouse, Robertsbridge, East Sussex, TN32 5BH |
| ZHANG, Jack RESIGNED | Director | 28 Jul 2016 | 10 Aug 2026 | United States | September 1946 | Ground Floor, Templeback, 10 Temple Back, Bristol, BS1 6FL, United Kingdom |