| Alan Philip Scott | Director | 26 Feb 2013 | 30 Aug 2013 | British | 60 years |
| Alistair James Wivell | Director | 21 Jun 1989 | 1 Nov 2004 | British | 81 years |
| Bernard John Wiley | Director | 21 Nov 1989 | 15 Sept 1990 | British | - |
| Beverley Edward John Dew | Director | 30 Aug 2013 | 5 Dec 2014 | British | 55 years |
| Brian Osborne | Director | 20 Sept 1990 | 1 Nov 2004 | British | 74 years |
| Charles Nicholas Pollard | Director | 22 Oct 2014 | 1 Jul 2015 | British | 68 years |
| Christopher Charles Millard | Director | 6 Mar 2015 | 31 Dec 2015 | British | 65 years |
| Christopher John Shakland | Director | 1 Oct 2012 | 21 May 2013 | British | 55 years |
| David Gordon Smith | Director | 25 Jan 2019 | 31 Dec 2019 | British | 66 years |
| David John Donaldson | Director | 1 Feb 2000 | 15 Aug 2014 | British | 74 years |
| David Lynn Rhys Harris | Director | 15 Aug 1990 | 31 Jul 1991 | British | 84 years |
| David Michael Grist | Director | 18 Dec 1989 | 15 Sept 1990 | British | 78 years |
| David Samuel Kennedy | Director | 24 Mar 2016 | 31 Jan 2017 | British | 68 years |
| Dean John Banks | Director | 8 Jun 2015 | 10 Feb 2021 | British | 55 years |
| Derek Knox | Director | 1 Oct 2004 | 21 May 2013 | British | 68 years |
| Ewan Thomas Anderson | Director | 30 May 2014 | 14 Apr 2015 | British | 60 years |
| Graeme Taylor | Director | 21 Dec 1998 | 28 Sept 2012 | British | 74 years |
| Graeme Taylor | Secretary | 21 Dec 1998 | 28 Sept 2012 | British | - |
| Graham Godfrey Rice | Director | 18 Jul 1994 | 16 Jan 1997 | United Kingdom | 78 years |
| Graham Ronald Hill | Director | 14 Jun 2017 | 17 Feb 2021 | British | 64 years |
| Gregory William Mutch | Secretary | 28 Sept 2012 | 30 Sept 2015 | - | - |
| Haro Moushegh Bedelian | Director | 15 Aug 1990 | 18 Jul 1994 | British | 83 years |
| Harry Worthington Townley | Director | 3 Jul 2003 | 21 May 2013 | British | 78 years |
| Henry Robinson Tarn | Director | 21 Jun 1989 | 30 Apr 1996 | British | 81 years |
| James Baxter Gibson | Director | 21 Jun 1989 | 1 Jul 2002 | British | 84 years |
| James Joseph Duffy | Director | 14 Jun 2017 | 17 Mar 2021 | British | 60 years |
| James Kenneth Tait | Director | 21 Jun 1989 | 21 Dec 1998 | British | 85 years |
| James Kenneth Tait | Secretary | 21 Jun 1989 | 21 Dec 1998 | British | - |
| James Lindsay Nicolson | Director | 18 Dec 1989 | 15 Sept 1990 | British | 80 years |
| James Lindsay Nicolson | Director | 7 May 2002 | 31 Jul 2007 | British | 80 years |
| Jane Elizabeth Whitfield | Director | 3 Jul 2003 | 21 Dec 2010 | British | 71 years |
| John Anthony Meade Walsh | Director | 28 Oct 2005 | 21 May 2013 | British | 62 years |
| John Keaveney | Director | 30 Jan 2015 | 30 Jun 2017 | Irish | 54 years |
| John Samuel | Director | 24 Apr 1995 | 11 Nov 2003 | British | 74 years |
| John Stewart Barron | Director | 6 Feb 2013 | 30 Jun 2014 | British | 69 years |
| Jonathan Granville Winter | Director | 1 Jul 2017 | 24 Sept 2018 | British | 66 years |
| Jonathan Henry Adams | Director | 28 Oct 2005 | 21 May 2013 | British | 62 years |
| Kenneth James Winter | Director | 21 Jun 1989 | 1 Jan 2006 | British | 81 years |
| Lindsay Mcgibbon | Director | 8 Aug 2022 | 22 Nov 2024 | British | 59 years |
| Mark Farrah | Director | 26 Feb 2013 | 13 Aug 2017 | British | 62 years |
| Mark Lloyd Cutler | Director | 11 Mar 2014 | 11 Nov 2014 | British | 58 years |
| Mark William Bullock | Director | 10 Feb 2021 | 31 Dec 2023 | British | 63 years |
| Marshall Duncan Scott | Director | 18 Jul 1994 | 12 Mar 2012 | British | 80 years |
| Michael John Peasland | Director | 21 Jun 1989 | 1 Feb 1999 | British | 74 years |
| Michael John Peasland | Director | 21 May 2013 | 31 Dec 2013 | British | 74 years |
| Michael William Welton | Director | 18 Jul 1994 | 31 Dec 1999 | British | 80 years |
| Murray John Easton | Director | 6 Mar 2013 | 16 Oct 2015 | British | 71 years |
| Neil Patterson | Director | 26 Feb 2013 | 30 Jan 2015 | British | 68 years |
| Paul Francis Gandy | Director | 26 Aug 2014 | 24 Mar 2016 | British | 66 years |
| Paul John Lester | Director | 1 Jan 2000 | 28 Jun 2002 | British | 77 years |
| Peter John Leach | Director | 21 Nov 1989 | 15 Sept 1990 | British | 78 years |
| Robert Clark | Director | 3 Jul 2003 | 29 Aug 2014 | British | 69 years |
| Robert Vincent Walker | Director | 26 Feb 2013 | 24 May 2013 | British | 68 years |
| Simon Charles Kirkpatrick | Director | 14 Apr 2015 | 19 Sept 2016 | British | 48 years |
| Stephen John Tarr | Director | 6 Feb 2013 | 19 Sept 2016 | British | 67 years |
| Stephen John Waite | Director | 20 Mar 2013 | 1 Jul 2013 | British | 74 years |
| Stuart Edward Curl | Director | 5 Dec 2014 | 31 May 2016 | British | 65 years |
| Thomas Allan Edgcumbe | Director | 14 Aug 2017 | 28 Feb 2022 | British | 46 years |
| William Edward Kingwill | Director | 22 Apr 2013 | 14 Oct 2014 | British | 65 years |
| William Owen Aitchison | Director | 26 Feb 2013 | 30 May 2014 | British | 72 years |