| Alan John Scott Marsh | Director | 8 Jun 1992 | 24 May 1994 | British | 89 years |
| Alan Murray Ferguson | Director | 1 Jan 1999 | 14 Sept 2005 | British | 67 years |
| Alison Jane Cooper | Director | 1 Jul 2009 | 28 Feb 2017 | British | 59 years |
| Andre Pierre Joseph Lacroix | Director | 1 Sept 2005 | 31 Mar 2015 | French | 65 years |
| Andrew Douglas Cummins | Director | 8 Jun 1992 | 31 Dec 1997 | Australian | 76 years |
| Anthony George Laurence Alexander | Director | 29 Jan 1993 | 16 May 2002 | British | 87 years |
| Barbara Mary Richmond | Director | 3 Apr 2006 | 30 Jun 2009 | British | 65 years |
| Bernd Jurgen Hintz | Director | 1 Feb 1994 | 23 Apr 1998 | American | 83 years |
| Charles Dorsey Mackay | Director | 8 Jun 1992 | 30 Jun 1996 | British | 85 years |
| Colin Marsh Marshall | Director | 7 Nov 1995 | 15 Jun 2000 | British | 92 years |
| Coline Lucille Mcconville | Director | 1 Jun 2014 | 31 Jul 2019 | Australian | 61 years |
| David Alexander Orr | Director | 8 Jun 1992 | 30 Sept 1992 | British | 103 years |
| David Arnold Stuart Plastow | Director | 8 Jun 1992 | 31 Dec 1995 | British | 93 years |
| David Glyndwr John | Director | 8 Jun 1992 | 31 Dec 1995 | British | 87 years |
| David Scotland | Director | 24 Feb 2005 | 10 May 2012 | British | 77 years |
| Derek Jesse Whittaker | Director | 8 Jun 1992 | 27 May 1993 | British | 96 years |
| Gijsbert De Zoeten | Director | 1 Sept 2019 | 27 Nov 2022 | Dutch | 59 years |
| Graeme John Potts | Director | 10 Sept 2002 | 17 Sept 2006 | British | 68 years |
| Graham Fenwick Pimlott | Director | 25 Mar 2008 | 6 Oct 2010 | British | 76 years |
| Graham Fenwick Pimlott | Director | 6 Oct 2010 | 31 Oct 2010 | British | 76 years |
| Hugh Edward Norton | Director | 1 Jan 1995 | 13 May 2004 | British | 89 years |
| Jane Sarah May Kingston | Director | 25 Jul 2018 | 9 May 2024 | British | 68 years |
| Jean Paul Parayre | Director | 8 Jun 1992 | 24 May 1994 | French | 88 years |
| John Langston | Director | 1 Aug 2013 | 18 May 2023 | British | 76 years |
| John Leopold Egan | Director | 15 Jun 2000 | 31 Dec 2005 | British | 86 years |
| John Michael Wemms | Director | 29 Jan 2004 | 12 May 2011 | British | 85 years |
| John Patrick Mcconnell | Director | 1 Oct 2009 | 29 Feb 2016 | British | 64 years |
| Kanwarpal Singh Bindra | Director | 1 Jul 2011 | 8 Oct 2015 | American | 61 years |
| Karen Guerra | Director | 1 Jan 2006 | 14 May 2009 | British | 69 years |
| Kenneth George Hanna | Director | 27 Sept 2001 | 24 May 2018 | British | 72 years |
| Leslie Gray Cullen | Director | 21 Apr 1997 | 30 Jun 1999 | British | 73 years |
| Liam Gerald Strong | Director | 29 Jan 1993 | 14 Jul 2000 | British | 80 years |
| Nigel Hargreaves Northridge | Director | 1 Jul 2009 | 23 May 2019 | British | 69 years |
| Nigel Macrae Stein | Director | 8 Oct 2015 | 9 May 2024 | British | 70 years |
| Paul Ming Fun Cheng | Director | 20 Feb 1995 | 22 May 1997 | American | 89 years |
| Penelope Claire Chapman | Secretary | 30 Jun 2007 | 31 Jul 2012 | British | - |
| Peter Baring | Director | 8 Jun 1992 | 21 May 1996 | British | 90 years |
| Peter Brian Baxendell | Director | 8 Jun 1992 | 31 Dec 1993 | British | 100 years |
| Peter Laister | Director | 8 Jun 1992 | 18 Mar 1993 | British | 96 years |
| Peter William Johnson | Director | 1 Jan 1998 | 14 May 2009 | British | 78 years |
| Philip Edward Cushing | Director | 8 Jun 1992 | 30 Jun 1999 | British | 75 years |
| Rachel Clare Empey | Director | 26 May 2016 | 30 Apr 2021 | British | 49 years |
| Raymond Kuo Fung Chien | Director | 1 Jul 1997 | 14 May 2009 | Chinese H.k | 73 years |
| Reginald Frank Heath | Director | 8 Jun 1992 | 31 Aug 1994 | British | 84 years |
| Richard David Howes | Director | 11 Apr 2016 | 31 Aug 2019 | British | 56 years |
| Robert Temple Armstrong Of Ilminster | Director | 8 Jun 1992 | 23 May 1995 | British | 98 years |
| Rodney Charles O'donoghue | Director | 8 Jun 1992 | 23 Apr 1998 | British | 87 years |
| Roy Charles Williams | Secretary | 8 Jun 1992 | 30 Jun 2007 | British | - |
| Sarah Mary Kuijlaars | Director | 21 Jan 2022 | 13 Apr 2025 | British | 58 years |
| Simon Alexander Borrows | Director | 6 Oct 2010 | 21 May 2015 | British | 66 years |
| Simon Brooke Tanlaw | Director | 8 Jun 1992 | 1 Jan 1993 | British | 91 years |
| Simon Manwaring Robertson | Director | 21 May 1996 | 12 May 2005 | British | 84 years |
| Simon Rory Arnold | Director | 8 Jun 1992 | 24 May 1994 | British | 92 years |
| Stefan Andreas Bomhard | Director | 1 Apr 2015 | 30 Jun 2020 | German | 58 years |
| Till Bernhard Vestring | Director | 1 Sept 2011 | 19 May 2022 | German | 61 years |
| Trevor Howard Taylor | Director | 1 Jan 1998 | 31 Dec 2004 | British | 88 years |
| William Meredith Samuel | Director | 26 Jan 2005 | 16 May 2013 | British | 73 years |