| Andrew Stephen Gulliford | Director | 1 May 2013 | 30 Jun 2023 | British | 63 years |
| Andrew William Palmer | Director | 28 Jan 2004 | 23 Apr 2013 | British | 72 years |
| Christopher Arden Peacock | Director | 28 Jan 2004 | 23 Apr 2013 | British | 80 years |
| Christopher Charles Fisher | Director | 1 Oct 2012 | 30 Sept 2021 | British | 72 years |
| Christopher George Francis Harding | Director | 2 Nov 1992 | 18 May 1994 | British | 86 years |
| Christopher Roger Ettrick Brooke | Director | 1 Jun 1992 | 15 May 2001 | British | 94 years |
| David Edmund Frederick Simons | Director | 1 Jun 1992 | 2 Oct 2002 | British | 85 years |
| Derek Robert Wilson | Director | 1 Jun 1992 | 31 Dec 2002 | British | 81 years |
| Donald James Dundas Maitland | Director | 1 Jun 1992 | 31 Aug 1992 | British | 103 years |
| Douglas Kramer | Director | 1 Jun 1992 | 17 May 2005 | United States | 89 years |
| Douglas Russell Webb | Director | 1 May 2010 | 30 Sept 2019 | British | 64 years |
| Elizabeth Ann Blease | Secretary | 21 May 2008 | 7 Jun 2021 | British | - |
| Gerald Michael Nolan Corbett | Director | 1 Mar 2016 | 30 Jun 2022 | British | 74 years |
| Gerald Nigel Mobbs | Director | 1 Jun 1992 | 21 Oct 2005 | British | 88 years |
| Gordon Wesley Jewkes | Director | 1 Jun 1992 | 14 May 2002 | British | 94 years |
| Hugh Linklater Thomson | Director | 1 Jun 1992 | 31 Aug 1998 | British | 80 years |
| Ian Calvert Sutcliffe | Director | 1 Jul 2008 | 28 Apr 2011 | British | 66 years |
| Ian David Coull | Director | 1 Jan 2003 | 28 Apr 2011 | British | 75 years |
| Ines Violaine Marie Reinmann | Director | 1 Nov 2008 | 11 Jan 2010 | French | 68 years |
| John Anthony Nicholas Heawood | Director | 4 Nov 1996 | 4 Jul 2008 | British | 72 years |
| John Robert Probert | Secretary | 1 Jun 1992 | 21 May 2008 | British | - |
| John Roddick Russell Macgregor | Director | 6 Jan 1995 | 16 May 2006 | British | 88 years |
| Julia Foo | Secretary | 7 Jun 2021 | 18 May 2023 | - | - |
| Justin Richard Read | Director | 30 Aug 2011 | 31 Dec 2016 | British | 64 years |
| Lesley Anne Macdonagh | Director | 1 Jan 2007 | 31 Dec 2009 | British | 73 years |
| Margaret Anne Ford | Director | 1 Jan 2013 | 19 Apr 2018 | British | 68 years |
| Mark Robertshaw | Director | 1 Jun 2010 | 31 Jul 2018 | British | 57 years |
| Marshall Douglas Lees | Director | 25 Mar 1998 | 1 Aug 2007 | Canadian | 72 years |
| Martin Richard Moore | Director | 1 Jul 2014 | 31 Dec 2023 | English | 69 years |
| Nigel Mervyn Sutherland Rich | Director | 1 Jul 2006 | 22 Apr 2016 | British | 80 years |
| Norman Roy Blackwell | Director | 1 Apr 2001 | 29 Apr 2010 | British | 73 years |
| Paul David Orchard Lisle | Director | 1 Jun 1992 | 1 Oct 2006 | British | 87 years |
| Philip Anthony Redding | Director | 1 May 2013 | 31 Jan 2020 | British | 57 years |
| Richard David Cairns Hubbard | Director | 9 Dec 1994 | 8 Nov 2001 | British | 89 years |
| Richard David Kingston | Director | 1 Apr 1996 | 31 Dec 2006 | British | 77 years |
| Roger William Carey | Director | 1 Jun 1992 | 30 Apr 1996 | British | 81 years |
| Stephen Lee Howard | Director | 16 May 2001 | 29 Apr 2010 | British | 72 years |
| Thomas Wiliam Wernink | Director | 23 May 2005 | 30 Apr 2014 | Dutch | 80 years |
| Walter Emile Rosa Hens | Director | 1 Jan 2007 | 31 Dec 2008 | Belgian | 77 years |