| Adrian Patrick White | Director | 21 Mar 2022 | 23 May 2024 | British | 58 years |
| Aidene Frances Walsh | Director | 19 Jun 2013 | 27 Apr 2016 | British | 58 years |
| Alastair John Michie | Director | 16 Mar 1993 | 31 Oct 1997 | British | 77 years |
| Andrew Henry Longhurst | Director | 31 Oct 1997 | 15 Apr 1998 | British | 86 years |
| Andrew Ralph England | Director | 2 May 2012 | 19 Jun 2013 | British | 68 years |
| Colin Walsh | Director | 1 Mar 2006 | 19 Mar 2009 | United States | 57 years |
| Damian Zaplata | Director | 9 Feb 2016 | 13 Oct 2017 | Polish | 52 years |
| David Gregg Yates | Director | 1 Nov 2004 | 7 Dec 2007 | British | 63 years |
| David James Stanley Oldfield | Director | 19 Jun 2013 | 28 Oct 2013 | British | 63 years |
| David Ronald Gagie | Director | 29 Apr 2002 | 18 Feb 2005 | British | 70 years |
| Deborah Ann Saunders | Director | 20 Jun 1994 | 30 Oct 1997 | British | 65 years |
| Deborah Ann Saunders | Secretary | 16 Mar 1993 | 20 Jun 1994 | British | - |
| Edward Clarence Nafus | Director | 31 Oct 1997 | 15 Aug 1998 | American | 85 years |
| Eula Lee Adams | Director | 30 Oct 1998 | 16 Aug 2000 | African American | 75 years |
| Frederick Charles Archibald Maslen | Director | 16 Mar 1993 | 30 Jun 1994 | British | 91 years |
| Gerald Edward Roulston Hawkins | Director | 31 Oct 1997 | 31 Jul 2000 | British | 77 years |
| Gerald Edward Roulston Hawkins | Director | 16 Aug 2000 | 1 Nov 2004 | British | 77 years |
| Gordon Francis Pell | Director | 15 Apr 1998 | 7 Jan 2000 | British | 75 years |
| Gregory David Gould | Director | 24 Jun 2016 | 31 Jan 2022 | British | 56 years |
| Hans-wolfgang Main | Director | 16 Mar 1993 | 1 Jun 1996 | British | 83 years |
| Helen Suzanne Rodgers | Director | 20 Jun 1994 | 31 Oct 1997 | British | 61 years |
| Helen Suzanne Rodgers | Secretary | 30 Oct 1997 | 11 Oct 2001 | British | - |
| Hubert O'donoghue | Director | 28 Jul 2015 | 30 Jul 2018 | Irish | 61 years |
| Karen Kristina Parker | Secretary | 20 Jun 1994 | 30 Oct 1997 | British | - |
| Mia Shernoff | Director | 11 Feb 2020 | 12 Dec 2022 | American | 72 years |
| Michael Charles Regnier | Director | 2 Feb 2012 | 19 Jun 2013 | British | 54 years |
| Michael Roger Hatcher | Director | 16 Mar 1993 | 30 Oct 1997 | British | 66 years |
| Michelle Antoinette Angela Johnson | Secretary | 19 Nov 2015 | 9 Nov 2017 | - | - |
| Nigel Ronald Leacock | Director | 4 Dec 2003 | 2 Feb 2012 | British | 67 years |
| Paul Andrew Gordon | Director | 27 Apr 2016 | 13 Jun 2016 | British | 58 years |
| Paul Campbell | Director | 21 Jun 2013 | 9 Feb 2016 | British | 69 years |
| Peter George Edwin Ayliffe | Director | 26 Sept 2000 | 29 Apr 2002 | British | 72 years |
| Peter James Martin | Director | 21 Feb 2000 | 4 Dec 2003 | British | 73 years |
| Peter James Martin | Director | 18 Feb 2005 | 28 Feb 2006 | British | 73 years |
| Peter Lee Harrington | Director | 7 Dec 2007 | 8 Dec 2008 | American | 65 years |
| Philip Robert Grant | Director | 28 Oct 2013 | 24 Jun 2016 | British | 59 years |
| Philip Stunt | Director | 8 Feb 2018 | 13 Feb 2020 | British | 62 years |
| Ricardo Vásquez | Secretary | 19 Jun 2013 | 19 Nov 2015 | - | - |
| Richard Michael Dallas | Director | 19 Mar 2009 | 2 May 2012 | British | 55 years |
| Robert Charles Neagle | Director | 24 Jul 2012 | 28 Jul 2015 | Usa | 72 years |
| Robert Schimenz | Director | 8 Apr 1998 | 7 Dec 2007 | American | 70 years |
| Roger Pierce | Director | 31 Oct 1997 | 19 Feb 1998 | American | 84 years |
| Sarah Saigol | Director | 23 May 2024 | 25 Sept 2024 | British | 47 years |
| Sharon Noelle Slattery | Secretary | 11 Oct 2001 | 19 Jun 2013 | Irish | - |
| Stephen John Everett | Director | 1 Nov 2020 | 28 Nov 2024 | British | 59 years |
| Stephen Laurie Warner | Director | 8 Dec 2008 | 24 Jul 2012 | British | 65 years |
| Stuart David Bonham | Director | 7 Dec 2007 | 21 Jun 2013 | British | 69 years |
| Tony Nash | Director | 13 Jun 2016 | 1 Nov 2020 | British | 60 years |
| Zoe Isabel Treloar | Director | 12 Dec 2022 | 28 Mar 2025 | British | 53 years |