| Adrian Paul Devlin | Secretary | 1 Jan 2002 | 30 Sept 2006 | British | - |
| Alan Stewart Frame | Director | 21 Jul 2009 | 31 Jan 2013 | British | 55 years |
| Alexander Brian Cooper Short | Director | 30 Jan 2004 | 31 Mar 2005 | British | 59 years |
| Andrew Stuart Mclean | Secretary | 1 Oct 2006 | 29 Mar 2012 | British | - |
| Anthony Leonard Hunt | Director | 22 Sept 1998 | 31 Mar 2005 | British | 80 years |
| Badrinath Ekkadu Narasimhan | Director | 1 Oct 2022 | 1 May 2025 | British | 52 years |
| Balduccio De Nardis Di Prata | Director | 18 Oct 1991 | 12 Oct 1995 | Italian | 94 years |
| Bernard Louis Teltscher | Director | 18 Oct 1991 | 31 Mar 1995 | British | 103 years |
| Brian Michael Hibbert | Director | 13 Oct 1995 | 30 Sept 2006 | British | 73 years |
| Christie Elizabeth Mccluskey | Secretary | 1 Dec 2016 | 17 Dec 2017 | - | - |
| Christopher John Mackenzie Searle | Director | 3 Sept 1993 | 14 Jun 2006 | British | 76 years |
| Christopher Wesley Mason | Director | 1 Nov 2006 | 13 Dec 2018 | British | 73 years |
| Craig Alexander Martin | Director | 11 Mar 2011 | 11 Jul 2014 | British | 51 years |
| Douglas William Laing | Director | 1 Jun 2019 | 19 May 2021 | British | 54 years |
| Eric Anthony Barton | Director | 6 Nov 1991 | 2 Dec 1993 | British | 81 years |
| Ewan John Henderson | Director | 12 Jan 2017 | 31 May 2019 | British | 58 years |
| Ewan John Henderson | Director | 1 Jun 2019 | 18 Oct 2021 | British | 58 years |
| Gary Michael James Keogh | Director | 1 Jun 2019 | 19 May 2021 | Irish | 52 years |
| Gordon Norman Alan Dron | Director | 1 Oct 2006 | 31 Jul 2013 | British | 66 years |
| Iain David Short | Director | 18 Apr 2017 | 13 Dec 2018 | British | 45 years |
| James John Taylor | Director | 13 Dec 2018 | 18 Oct 2021 | British | 46 years |
| Javier Ferran | Director | 18 Oct 1991 | 14 Oct 1995 | Spanish | 70 years |
| Jeremy Sunder Ede | Director | 1 Feb 2013 | 28 Feb 2014 | British | 63 years |
| John Edward Beard | Director | 1 Dec 2004 | 30 Sept 2006 | British | 64 years |
| Jonathan Mark Yusen | Director | 18 Oct 2021 | 30 Sept 2022 | American | 56 years |
| Karen Louise Forbes | Secretary | 18 Dec 2017 | 30 Aug 2019 | - | - |
| Kieran Gerard Phelan | Director | 1 Jun 2019 | 19 May 2021 | Irish | 61 years |
| Leslie Brewer | Secretary | 27 Jan 1998 | 31 Dec 2001 | British | - |
| Malcolm John Himat | Secretary | 18 Oct 1991 | 27 Jan 1998 | British | - |
| Mark Christopher Woolley | Director | 18 Oct 2021 | 14 Feb 2025 | British | 42 years |
| Matthew James Billinghurst | Director | 1 Jun 2019 | 19 May 2021 | British | 43 years |
| Michael Hans Stephen Corbyn Herbert | Director | 26 Feb 2001 | 31 Dec 2002 | British | 66 years |
| Michael Lamont | Director | 22 Sept 1998 | 6 Oct 2000 | British | 66 years |
| Patrick Albaladejo | Director | 27 May 2002 | 30 Nov 2003 | French | 70 years |
| Paul Bernard Dollman | Director | 27 Nov 2000 | 27 May 2002 | British | 70 years |
| Paul Geoffrey Hancock | Director | 14 Nov 2013 | 18 Apr 2017 | British | 57 years |
| Paul Henry Rochford | Director | 1 Apr 2005 | 21 Jul 2009 | British | 63 years |
| Paul Henry Rochford | Director | 8 Nov 2013 | 31 Dec 2021 | British | 63 years |
| Peter Charles Favier | Secretary | 13 Feb 1991 | 26 Jun 1991 | British | - |
| Rita Maria Greenwood | Director | 15 Feb 2016 | 19 May 2021 | British | 58 years |
| Simon Francis Gould | Director | 1 Sept 1994 | 19 Apr 1999 | British | 71 years |
| Simon John Hunt | Director | 8 Nov 2013 | 16 Mar 2016 | British | 55 years |
| Simon Peter Macdonald | Director | 1 Apr 2005 | 29 Sept 2006 | British | 66 years |
| Stella Julie David | Director | 20 Apr 1999 | 24 Nov 2004 | British | 64 years |
| Susan Pamela Dunn | Director | 20 Feb 2007 | 11 Mar 2011 | British | 63 years |
| Timothy Ado Carton | Director | 22 Sept 1998 | 26 Feb 2001 | Irish | 67 years |
| Timothy Ado Carton | Director | 28 Feb 2003 | 20 Feb 2007 | Irish | 67 years |
| William John Payne | Secretary | 29 Mar 2012 | 30 Nov 2016 | British | - |