| Akiyoshi Nakagawa | Director | 24 Sept 1997 | 22 Dec 1998 | Japanese | 83 years |
| Andrew David Smith | Director | 18 Jul 2012 | 14 Feb 2014 | British | 50 years |
| Andrew Marc Jones | Director | 28 Jul 2005 | 6 Nov 2009 | British | 58 years |
| Anthony Braine | Director | 18 Dec 2006 | 8 May 2007 | British | 69 years |
| Atsuhiro Kato | Director | 26 Jul 1991 | 13 Jul 1995 | Japanese | 94 years |
| Christopher Michael John Forshaw | Director | 18 Dec 2006 | 8 May 2007 | British | 77 years |
| Eugene Francis Doyle | Director | 5 Jan 2001 | 30 Jul 2002 | Irish | 69 years |
| Gavin Bergin | Director | 15 Oct 2021 | 17 Aug 2022 | British | 36 years |
| Harold Raymond Mould | Director | 20 Aug 2002 | 28 Jul 2005 | British | 86 years |
| Humphrey James Montgomery Price | Director | 5 Jan 2001 | 28 Jul 2005 | British | 84 years |
| Iwao Miyawaki | Director | 25 Feb 1992 | 24 Sept 1997 | Japanese | 82 years |
| John Dering Nettleton | Director | 26 Jul 1991 | 5 Jan 2001 | English | 82 years |
| Katsuaki Tatobe | Director | 25 Feb 1992 | 22 Dec 1998 | Japanese | 87 years |
| Lucinda Margaret Bell | Director | 22 Nov 2006 | 8 May 2007 | British | 62 years |
| Manyoshi Tsuboi | Director | 26 Jul 1991 | 25 Feb 1992 | Japanese | 81 years |
| Mark Andrew Stirling | Director | 28 Jul 2005 | 6 Nov 2009 | British | 63 years |
| Martin Francis Mcgann | Director | 26 Feb 2003 | 7 Oct 2005 | British | 65 years |
| Michael Anthony Wilson | Secretary | 26 Jul 1991 | 22 Mar 2001 | British | - |
| Nigel Mark Webb | Director | 22 Nov 2006 | 8 May 2007 | British | 63 years |
| Patrick Lionel Vaughan | Director | 5 Jan 2001 | 3 Mar 2001 | British | 79 years |
| Paul Christopher Ronald Wates | Director | 26 Jul 1991 | 5 Jan 2001 | British | 88 years |
| Peter Courtenay Clarke | Director | 22 Nov 2006 | 8 May 2007 | British | 60 years |
| Philip John Martin | Director | 13 Oct 2009 | 31 Oct 2016 | British | 69 years |
| Philip John Martin | Secretary | 22 Mar 2001 | 31 Oct 2016 | British | - |
| Robert Samuel | Director | 23 Mar 2010 | 12 Jan 2018 | British | 56 years |
| Rodney Clutton | Director | 26 Jul 1991 | 5 Jan 2001 | British | 80 years |
| Sarah Morrell Barzycki | Director | 22 Nov 2006 | 8 May 2007 | British | 68 years |
| Seishiro Mimura | Director | 26 Jul 1991 | 25 Feb 1992 | Japanese | 85 years |
| Tatsuo Yoshida | Director | 13 Jul 1995 | 22 Dec 1998 | Japanese | 95 years |
| Timothy Andrew Roberts | Director | 22 Nov 2006 | 8 May 2007 | British | 62 years |
| Valentine Tristram Beresford | Director | 28 Jul 2005 | 6 Nov 2009 | British | 61 years |