| ACHARYA, Mukta ACTIVE | Director | 18 Jul 2025 | | Switzerland | August 1984 | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| BARTON, Jill RESIGNED | Secretary | 24 Nov 2011 | 03 Jan 2012 | | | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| BASINGER, Auriol Gay RESIGNED | Secretary | | 31 Mar 1994 | | | 23 Bideford Close, Woodley, Reading, RG5 3SE |
| HAMMER, Achim RESIGNED | Secretary | 20 Jan 2012 | 22 Jun 2023 | | | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| KENT, Richard RESIGNED | Secretary | | 01 Apr 1992 | | | 8 The Green, Harrold, Bedford, Bedfordshire, MK43 7DB |
| MORTIMER, Anne RESIGNED | Secretary | 01 Apr 1994 | 24 Nov 2011 | | | Farthings 249 Greys Road, Henley On Thames, Oxfordshire, RG9 1QN |
| BASINGER, Auriol Gay RESIGNED | Director | 01 Jan 1993 | 31 Mar 1994 | | December 1945 | 23 Bideford Close, Woodley, Reading, RG5 3SE |
| BECCARI, Andrea Maria RESIGNED | Director | 01 Nov 2011 | 30 Nov 2017 | Switzerland | November 1957 | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| BOSSART, Albert RESIGNED | Director | 01 Aug 1993 | 30 Sep 1994 | | May 1958 | Feldbachstrasse 80, 8634 Hombrechtikon, Switzerland |
| DANIELS, Graeme Paul, Dr RESIGNED | Director | 13 Jul 2010 | 31 Dec 2010 | United Kingdom | August 1970 | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| DUCHTING, Matthias RESIGNED | Director | 02 Feb 2009 | 26 Nov 2009 | | June 1962 | Glarnischstrasse 16, Stafa, Zurich, 8712, Switzerland |
| KAELIN, Joe RESIGNED | Director | 01 Jan 1999 | 22 Nov 2002 | | July 1960 | Im Riet 13, Stafa, 8712, Switzerland |
| KENT, Richard RESIGNED | Director | | 01 Apr 1992 | | July 1958 | 8 The Green, Harrold, Bedford, Bedfordshire, MK43 7DB |
| LINDEMANN, Bernhard RESIGNED | Director | 29 Jun 1998 | 01 Jan 1999 | | September 1959 | Gartenstr 3, Egg Bei Zurich, CH8132, Switzland |
| LUN, Klaus RESIGNED | Director | 31 Mar 2017 | 22 May 2024 | Switzerland | May 1972 | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| MITCHELL, Paul Howard RESIGNED | Director | 04 Jan 2000 | 31 Dec 2004 | | April 1962 | 19 Balland Way, Wootton, Northampton, Northamptonshire, NN4 6AU |
| NORRINGTON, Ian RESIGNED | Director | | 01 Aug 1999 | | May 1959 | Rose Cottage Church Lane, Harwell, Didcot, Oxfordshire, OX11 0EZ |
| PATTERSON, Richard Edward RESIGNED | Director | 01 Dec 2017 | 13 Nov 2020 | England | October 1971 | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| POPP, Petra RESIGNED | Director | 22 May 2024 | 17 Jul 2025 | Switzerland | November 1969 | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| RAMSAY, James Ian RESIGNED | Director | | 01 Jan 1993 | | April 1941 | 28 Abbotsford Crescent, Strathaven, Lanarkshire, ML10 6EQ |
| RUFENER, Jean-Louis RESIGNED | Director | | 31 Jul 1993 | | June 1945 | Feldbach Strasse 80, Hombrechtikon Ch8634, FOREIGN, Switzerland |
| RUTISHAUER, Marcel Philipp RESIGNED | Director | 10 Jun 2010 | 01 Nov 2011 | Switzerland | December 1962 | 103, Seestrasse, Mannedorf, Switzerland, 8708, Switzerland |
| RUTZER, Franz RESIGNED | Director | 01 Jan 2003 | 27 Feb 2004 | | October 1960 | Gugelmattstrasse 34, Widen 8967, Aargau, Switzerland |
| SCHMIDT, Gerald Emil, Dr RESIGNED | Director | 01 Nov 2011 | 17 Jan 2014 | Switzerland | August 1957 | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| TIMMERS, Jan RESIGNED | Director | 01 Oct 1994 | 01 Oct 1994 | | August 1962 | Feldbachstrasse 80, Ch 8634 Hombrechtikon, Switzerland |
| TRAEGER, Stefan Gunter, Dr. RESIGNED | Director | 01 Apr 2014 | 31 Mar 2017 | Switzerland | August 1967 | Theale Court, 11-13 High Street, Theale Reading, Berkshire, RG7 5AH |
| VON LUEDER, Martin RESIGNED | Director | 06 May 2004 | 10 Jun 2010 | Germany | May 1957 | Theodor- Storm, Str 17, Crailshelm, Germany, 74564 |
| WARREN, Jill RESIGNED | Director | 01 Sep 1999 | 04 Jan 2000 | | February 1958 | 2 Water Road, Reading, Berkshire, RG30 2NN |