| COOP, Richard Paul ACTIVE | Secretary | 26 Apr 2024 | | | | 228 Bath Road, Slough, Berkshire, SL1 4DX |
| GEIER-CIBIN, Ralf Manfred ACTIVE | Director | 13 Dec 2021 | | Switzerland | August 1962 | 228, Bath Road, Slough Berkshire, SL1 4DX, England |
| SCHWALLER, Johann Claude ACTIVE | Director | 01 May 2024 | | United Kingdom | February 1993 | 228 Bath Road, Slough, Berkshire, SL1 4DX |
| ANTHONY WILKINSON, Katherine Frances RESIGNED | Secretary | 08 Sep 1999 | 15 Dec 2000 | | | Cranbrook 65 Long Ashton Road, Long Ashton, Bristol, Avon, BS41 9HW |
| EDGELL, Jonathan William Farley RESIGNED | Secretary | | 08 Sep 1999 | | | 3 Dunnock Way, Wargrave, Reading, Berkshire, RG10 8LR |
| KENNEDY, Gerard RESIGNED | Secretary | 31 Jul 2003 | 26 Apr 2024 | | | 228 Bath Road, Slough, Berkshire, SL1 4DX |
| SYMES, Judith Ann RESIGNED | Secretary | 15 Dec 2000 | 31 Jul 2003 | | | 15 Prebend Mansions, Chiswick High Road, London, W4 2LU |
| ANTHONY WILKINSON, Katherine Frances RESIGNED | Director | 08 Sep 1999 | 15 Dec 2000 | United Kingdom | June 1965 | Cranbrook 65 Long Ashton Road, Long Ashton, Bristol, Avon, BS41 9HW |
| BAKER, Stephen Martin RESIGNED | Director | 15 Mar 2016 | 18 Jun 2017 | England | April 1955 | 228 Bath Road, Slough, Berkshire, SL1 4DX |
| BALDI, Alessandro, Vice President RESIGNED | Director | 15 Dec 2000 | 20 Dec 2001 | | August 1952 | Im Grund 1, Ebmatingen, Ch 8704, Switzerland |
| BLOOMFIELD, Terence James RESIGNED | Director | | 31 Jul 1996 | | August 1939 | Windaby Whyburn Lane, Hucknall, Nottingham, NG15 6QN |
| CARBERRY, Thomas RESIGNED | Director | 31 Jul 1996 | 08 Sep 1999 | United Kingdom | November 1947 | 1 Heather Close, Grove Road, Sonning Common, Oxon, RG4 9EF |
| CARTER, Nicholas Thomas RESIGNED | Director | 18 Jun 2017 | 01 Jul 2021 | United Kingdom | August 1981 | Lonza, Wheldon Road, Castleford, WF10 2JT, England |
| CHAKRAWERTTI, Sandeepan RESIGNED | Director | 01 Jul 2021 | 01 May 2024 | United Kingdom | March 1986 | 228 Bath Road, Slough, Berkshire, SL1 4DX |
| CRIPPS, Paul Anthony RESIGNED | Director | | 26 Jul 1994 | | November 1953 | Wicks Cottage, Wootton Rivers, Marlborough, Wilts, SN8 4NQ |
| EDGELL, Jonathan William Farley RESIGNED | Director | | 08 Sep 1999 | | November 1944 | 3 Dunnock Way, Wargrave, Reading, Berkshire, RG10 8LR |
| GEIER CIBIN, Ralf RESIGNED | Director | 15 Dec 2000 | 30 Apr 2009 | | August 1962 | 27 Gardiner Close, Abingdon, Oxfordshire, OX14 3YA |
| HAAG, Toralf, Dr RESIGNED | Director | 30 Aug 2005 | 15 Mar 2016 | Germany | March 1966 | Gossler Park 20, Hamburg, 22587, FOREIGN, Germany |
| KILBRIDE, Timothy Lawrence RESIGNED | Director | 08 Sep 1999 | 15 Dec 2000 | United Kingdom | June 1961 | The Old Vicarage, Upper Stanton Stanton Drew, Bristol, BS39 4EG |
| OPRANDI, Peter RESIGNED | Director | 30 Apr 2009 | 02 Apr 2015 | Usa | June 1968 | 14, September Drive, Greenland, Nh, 03840, United States |
| ROBINSON, Edward Raymond RESIGNED | Director | 08 Sep 1999 | 01 Sep 2000 | | July 1952 | 25 Monks Road, Virginia Water, Surrey, GU25 4RR |
| RUPP, Richard Helmut RESIGNED | Director | 15 Dec 2000 | 09 May 2002 | | June 1947 | Baselblick 1, 79540 Loerrach, Germany |
| SAVITZKY, Rodolfo RESIGNED | Director | 02 Apr 2015 | 30 Nov 2021 | Switzerland | March 1962 | 38 Muenchensteinerstrasse, 38 Muenchensteinerstrasse, Basel, Switzerland |
| SYMES, Judith Ann RESIGNED | Director | 08 Sep 1999 | 15 Dec 2000 | | November 1963 | 15 Prebend Mansions, Chiswick High Road, London, W4 2LU |
| WAIBEL, Roland Michael, Dr RESIGNED | Director | 20 Dec 2001 | 30 Aug 2005 | Switzerland | April 1958 | Hasenrain 36, Therwil, 4106, Switzerland |