| Alexander Park Leitch | Director | 1 Apr 1996 | 20 Feb 2004 | British | 79 years |
| Andrew Stephen Melcher | Director | 12 Jul 1996 | 15 Oct 1997 | U S | 77 years |
| Ann Claire Blundell | Secretary | 30 Jun 2013 | 25 Mar 2014 | - | - |
| Anne Torry | Director | 23 Sept 2016 | 4 May 2017 | British | 61 years |
| Brian Michael Thomas | Director | 1 Jan 1998 | 28 Feb 2002 | British | 74 years |
| Brian Pattison Garraway | Director | 8 Apr 1992 | 30 Jul 1992 | British | 95 years |
| Christian Vink | Director | 20 Mar 2020 | 12 Jul 2023 | Dutch | 50 years |
| Clive Frederick Coates | Director | 12 Jul 1996 | 31 Dec 1998 | British | 82 years |
| Daniel John Pender | Director | 28 Nov 2011 | 1 Jul 2013 | British | 51 years |
| David John Etherington | Director | 22 Apr 2005 | 25 Jun 2009 | British | 69 years |
| David Perrott Sims | Director | 27 Aug 2004 | 9 Oct 2009 | British | 68 years |
| David Philip Allvey | Director | 8 Apr 1992 | 31 Aug 1999 | British | 81 years |
| David William Smith | Director | 30 Sept 2014 | 25 Mar 2015 | British | 67 years |
| David Wilson | Secretary | 1 Aug 1993 | 12 Jul 1996 | British | - |
| Dennis William White | Director | 8 Sept 1998 | 4 Dec 2000 | British | 85 years |
| Derek Richard Woodward | Secretary | 31 May 1999 | 31 Aug 2001 | British | - |
| Dieter Franz-josef Wemmer | Director | 2 Jul 2010 | 31 Oct 2011 | British | 69 years |
| Eugen Urban Angehrn | Director | 28 Nov 2011 | 30 Sept 2015 | Swiss | 61 years |
| Francis Anthony Burke | Secretary | 8 Apr 1992 | 1 Aug 1992 | British | - |
| Gary Paul John Shaughnessy | Director | 11 Sept 2012 | 1 Jan 2016 | British | 60 years |
| Gavin Russell Cameron Munnoch | Director | 2 Feb 2007 | 9 Oct 2009 | British | 74 years |
| Geoffrey Martin Riddell | Director | 13 Dec 2002 | 20 Aug 2003 | British | 70 years |
| Geoffrey Martin Riddell | Director | 29 Sept 2006 | 2 Jul 2010 | British | 70 years |
| George Pallister Greener | Director | 30 Jul 1992 | 8 Mar 1996 | British | 81 years |
| Gillian Paula Browne | Director | 12 Jul 2023 | 30 Sept 2024 | Irish | 46 years |
| Ian Ritchie | Secretary | 30 Jun 2013 | 25 Mar 2014 | - | - |
| Inga Kristine Beale | Director | 3 Apr 2009 | 1 Jul 2011 | British | 63 years |
| James Anthony Wiltshire | Secretary | 12 Jul 1996 | 31 May 1999 | British | - |
| James Barrington Quin | Director | 23 Sept 2016 | 31 Aug 2018 | British | 57 years |
| James Richard Sykes | Director | 1 Jan 2016 | 23 Sept 2016 | British | 65 years |
| Johan Fredrik Solberg | Director | 27 Feb 2017 | 28 Jun 2019 | Swedish | 55 years |
| John Robert Dyke | Director | 2 Jul 2010 | 25 Oct 2013 | British | 57 years |
| Julian Temes | Director | 30 Sept 2015 | 31 Dec 2023 | Spanish | 54 years |
| Keith Reginald Baldwin | Director | 9 May 2001 | 20 Aug 2003 | British | 78 years |
| Kevin Timothy Hogan | Director | 2 Jul 2010 | 31 Dec 2011 | American | 64 years |
| Lawrence Churchill | Director | 13 Dec 2002 | 20 Aug 2003 | British | 80 years |
| Mario Greco | Director | 16 Apr 2008 | 2 Jul 2010 | Italian | 67 years |
| Mark Christopher Chessher | Director | 22 Apr 2005 | 18 Apr 2007 | British | 66 years |
| Mark George Culmer | Director | 3 Dec 2001 | 2 Dec 2003 | British | 64 years |
| Martin David Moule | Director | 2 Dec 2003 | 25 Apr 2005 | British | 71 years |
| Martin Faulkner Broughton | Director | 8 Apr 1992 | 7 Sept 1998 | British | 79 years |
| Martin Senn | Director | 3 Apr 2009 | 4 Jan 2010 | Swiss | 69 years |
| Michael Joseph Brennan | Director | 9 Oct 2009 | 31 Aug 2011 | British Irish | 74 years |
| Neil Andrew Freshwater | Director | 25 Oct 2013 | 23 Sept 2016 | British | 57 years |
| Neil James Evans | Director | 25 Mar 2014 | 31 Mar 2016 | British | 69 years |
| Nicolas Anthony Burnet | Director | 28 Jun 2019 | 17 Dec 2019 | American | 58 years |
| Nigel Lowe | Secretary | 22 Apr 2005 | 30 Jun 2013 | British | - |
| Oscar Clemente Tengtio | Director | 6 Jul 2009 | 27 Feb 2017 | American | 70 years |
| Patrick Henry O'sullivan | Director | 20 Aug 2003 | 9 Feb 2009 | British | 77 years |
| Patrick Henry Osullivan | Director | 15 Sept 1997 | 2 Dec 2002 | Irish | 77 years |
| Paul Sutton | Director | 28 Nov 2011 | 30 Sept 2018 | British | 68 years |
| Paul Victor Sant Manduca | Director | 12 Jul 1996 | 22 Feb 1999 | British | 75 years |
| Paulus Van De Geijn | Director | 27 Aug 2004 | 16 Apr 2008 | Dutch | 80 years |
| Peter Charles Godby | Secretary | 1 Aug 1992 | 1 Aug 1993 | British | - |
| Peter Charles Howe | Secretary | 4 Sept 2001 | 22 Apr 2005 | British | - |
| Phil Andrew Hodkinson | Director | 9 May 2001 | 14 Aug 2001 | British | 68 years |
| Philip Smith | Director | 12 Jul 1996 | 12 Oct 1998 | British | 79 years |
| Raymond Greenshields | Director | 4 Dec 2000 | 14 Oct 2002 | Australian | 79 years |
| Simon Howard Davies | Director | 9 May 2001 | 13 Dec 2002 | British | 67 years |
| Stephen James Leaman | Director | 26 Nov 2004 | 29 Sept 2006 | British | 79 years |
| Stephen Lewis | Director | 9 Oct 2009 | 26 Jun 2014 | British | 58 years |
| Timothy James Bailey | Director | 1 Jan 2021 | 10 Apr 2025 | British | 52 years |
| Tulsi Ratakonda Naidu | Director | 31 Aug 2017 | 31 Dec 2020 | British | 53 years |
| Vibhu Ranjan Sharma | Director | 25 Mar 2015 | 3 Nov 2015 | American | 60 years |
| Vyvyan James Attwood | Director | 9 May 2001 | 20 Aug 2003 | British | 77 years |
| Wayne Howard Fisher | Director | 20 Aug 2003 | 31 Dec 2006 | American | 82 years |
| William Wallace Dobbin | Director | 9 May 2001 | 20 Aug 2003 | British | 68 years |
| William Wallace Dobbin | Director | 1 Mar 2004 | 6 Apr 2005 | British | 68 years |