| Alexa Hamilton Henderson | Director | 24 Aug 2012 | 19 Jan 2018 | British | 64 years |
| Alexander Mark Hedderwick | Director | 23 Nov 1992 | 30 Jun 2008 | British | 77 years |
| Andrew Kyle Mulligan | Director | 6 Apr 2006 | 16 Nov 2009 | British | 61 years |
| Brian Martin Mulholland | Director | 17 Mar 2015 | 22 Aug 2016 | British | 51 years |
| Brian Mccrindle | Director | 9 Oct 2012 | 30 Dec 2016 | British | 58 years |
| Cameron Ian Mcphail | Director | 23 May 2000 | 19 Feb 2002 | British | 71 years |
| Charles Annand Fraser | Director | 22 Oct 1990 | 1 Oct 1998 | British | 97 years |
| Charles Lancaster Nicolson | Director | 22 Oct 1990 | 6 Sept 1993 | British | 78 years |
| Christopher George Pearson | Director | 6 Sept 1993 | 30 Aug 1996 | British | 79 years |
| David James Cathie | Director | 1 Jan 2005 | 3 Sept 2010 | British | 69 years |
| Didier Primat | Director | 22 Oct 1990 | 3 Jun 2005 | French | 81 years |
| Donald Graham | Director | 1 Oct 2000 | 16 Nov 2009 | British | 69 years |
| Donald Iain Mackay | Director | 22 Oct 1990 | 12 Mar 1991 | British | 88 years |
| Francesca Barnes | Director | 11 Jul 2017 | 20 Apr 2018 | British | 67 years |
| Francoise Primat-schlumberger | Director | 22 Oct 1990 | 6 Sept 1993 | French | 108 years |
| Gavin Christopher Frost | Director | 11 Feb 2011 | 20 Dec 2013 | British | 52 years |
| George Anthony Schofield | Director | 6 Sept 1993 | 31 Mar 1998 | British | 85 years |
| Georges Muller | Director | 22 Oct 1990 | 6 Sept 1993 | French | 84 years |
| Gordon Francis Pell | Director | 23 Jul 2002 | 2 Jan 2006 | British | 75 years |
| Graeme Thomas Hartop | Secretary | 6 Sept 1993 | 8 Nov 1994 | British | - |
| Harry James Morgan | Director | 17 Dec 2007 | 16 Nov 2009 | British | 65 years |
| Iain Andrew Noble | Director | 22 Oct 1990 | 6 Sept 1993 | British | 90 years |
| Ian Martin Dalziel | Director | 22 Oct 1990 | 21 Dec 1992 | British | 78 years |
| Ian Maxwell Ewart | Director | 2 May 2012 | 1 Sept 2015 | Swiss | 64 years |
| James Hedley Rawlingson | Director | 28 Sept 2009 | 21 Mar 2011 | British | 58 years |
| James Tait Laurenson | Director | 22 Oct 1990 | 16 May 1994 | British | 84 years |
| Jeremy Malbon Lowry | Secretary | 22 Oct 1990 | 6 Sept 1993 | British | - |
| Jeremy Paul Norfolk | Director | 22 Oct 1990 | 12 Mar 1991 | British | 77 years |
| John David Webber | Director | 22 Oct 1990 | 26 May 2009 | British | 78 years |
| John Duncan Baines | Director | 25 Oct 2005 | 6 Jun 2008 | British | 63 years |
| John Richard Hackett | Director | 25 Sept 2006 | 27 Nov 2009 | British | 65 years |
| Keith George Hodkinson | Director | 16 Feb 1998 | 31 Dec 2004 | British | 78 years |
| Kenneth Byron Coombs | Director | 28 Sept 2009 | 31 Dec 2011 | British | 65 years |
| Kerry Ann Falconer | Director | 15 Nov 2010 | 30 Nov 2015 | British | 65 years |
| Linda Hamilton Urquhart | Director | 24 Aug 2012 | 20 Apr 2018 | British | 66 years |
| Mark Joseph Lund | Director | 11 Jul 2017 | 21 Apr 2018 | British | 68 years |
| Michael John Morley | Director | 24 Aug 2009 | 17 Mar 2016 | British | 68 years |
| Michael Robert Regan | Director | 31 Oct 2016 | 31 Jan 2019 | British | 46 years |
| Miller Roy Mclean | Director | 18 May 1998 | 11 Jul 2017 | British | 76 years |
| Morven Gow | Secretary | 19 Jun 2013 | 24 Jul 2017 | - | - |
| Peter Gordon Flavel | Director | 17 Mar 2016 | 20 Apr 2018 | Australian | 65 years |
| Philip Taylor Morris | Director | 6 Sept 1993 | 12 Apr 2006 | British | 73 years |
| Raymond Marvin Entwistle | Director | 26 Feb 1990 | 31 Dec 2009 | British | 81 years |
| Robert Currie Cumming | Director | 22 Oct 1990 | 6 Sept 1993 | British | 104 years |
| Ronald Stuart Alexander | Secretary | 1 Sept 2006 | 7 Jan 2009 | British | - |
| Sally Anne Doyle | Secretary | 7 Jan 2009 | 19 Jun 2013 | British | - |
| Sarah Jane Deaves | Director | 6 Jun 2008 | 1 Jul 2009 | British | 64 years |
| Scott Edward Massie | Secretary | 8 Nov 1994 | 16 Jan 1995 | British | - |
| Simon Edward Callum Miller | Director | 23 Nov 1992 | 28 Feb 2010 | British | 73 years |
| William Arthur Waldegrave | Director | 11 Jul 2017 | 20 Apr 2018 | British | 79 years |
| William John Stanworth | Director | 1 Jan 2003 | 16 Nov 2009 | British | 65 years |
| William John Stanworth | Secretary | 16 Jan 1995 | 31 Aug 2006 | British | - |
| William Michael Clifford Kennedy | Director | 22 Jul 1996 | 31 Dec 2004 | British | 90 years |