| Alastair David Lyons | Director | 1 Oct 2008 | 23 May 2018 | British | 72 years |
| Ashley Caroline Steel | Director | 10 Jun 2021 | 18 May 2023 | British | 66 years |
| Brian Michael Johnson | Director | 1 Jul 1996 | 2 May 2001 | British | 78 years |
| Colin Peter Holmes | Director | 1 Dec 2006 | 16 May 2014 | British | 60 years |
| David James Ritchie | Director | 1 Jul 2002 | 9 Jan 2017 | British | 56 years |
| Earl Sibley | Director | 16 Apr 2015 | 20 Nov 2024 | British | 53 years |
| Gerald Nigel Mobbs | Director | 18 Feb 1997 | 9 Sept 2005 | British | 88 years |
| Graham Prothero | Director | 3 Jan 2020 | 11 Nov 2022 | British | 64 years |
| Helen Owers | Director | 18 May 2023 | 30 Sept 2025 | British | 62 years |
| Ian Paul Tyler | Director | 29 Nov 2013 | 18 May 2022 | British | 65 years |
| James Edward Ditheridge | Director | 1 Jul 1996 | 31 Mar 2001 | British | 78 years |
| Jeffrey W. Ubben | Director | 23 Mar 2023 | 11 Jan 2024 | American | 64 years |
| John Anthony Warren | Director | 1 Mar 2006 | 15 May 2015 | British | 72 years |
| John Michael Emery | Director | 1 Jul 1996 | 3 Jan 2002 | British | 83 years |
| John Michael Emery | Secretary | 1 Jul 1996 | 3 Jan 2002 | British | - |
| Jonathan Stanley Hill | Director | 23 Aug 2010 | 6 Mar 2015 | British | 57 years |
| Katherine Christina Mary Innes Ker | Director | 9 Oct 2018 | 18 May 2023 | British | 65 years |
| Kenneth Roy Parsons | Secretary | 14 Sept 1993 | 1 Jul 1996 | British | - |
| Lesley Anne Macdonagh | Director | 4 Jul 2003 | 6 May 2010 | British | 73 years |
| Malcolm Robert Harris | Director | 28 Jun 1996 | 29 Nov 2013 | British | 77 years |
| Margaret Christine Browne | Director | 1 Sept 2014 | 14 May 2025 | British | 65 years |
| Mark Patrick Nicholls | Director | 11 Jul 1997 | 11 May 2007 | British | 76 years |
| Martin Trevor Digby Palmer | Secretary | 1 Dec 2001 | 25 Jun 2021 | British | - |
| Michael John Stansfield | Director | 28 Nov 2017 | 30 Sept 2021 | British | 69 years |
| Michael Sharpe | Director | 1 Jul 1996 | 31 Jan 2002 | British | 79 years |
| Neil Cooper | Director | 2 Jan 2007 | 6 May 2010 | British | 58 years |
| Neville Tullah | Director | 1 Jul 1996 | 30 Aug 1996 | British | 81 years |
| Nigel John Keen | Director | 15 Nov 2016 | 23 Mar 2023 | British | 64 years |
| Peter Dennis Baker | Director | 1 Jul 1996 | 1 Feb 2002 | British | 76 years |
| Philip Leslie Warner | Director | 24 May 1991 | 28 Jun 1996 | British | 89 years |
| Ralph Graham Findlay | Director | 7 Apr 2015 | 16 May 2024 | British | 64 years |
| Ronald Norman Walford | Director | 16 Aug 1974 | 30 Jun 2002 | United Kingdom | 81 years |
| Ronald Norman Walford | Director | 24 May 1991 | 14 Sept 1993 | United Kingdom | 81 years |
| Ronald Norman Walford | Secretary | 24 May 1991 | 14 Sept 1993 | United Kingdom | - |
| Stephen Harvey Brazier | Director | 2 May 2001 | 31 Jul 2004 | British | 62 years |
| Timothy David Melville Ross | Director | 11 Jul 1997 | 2 Jul 2008 | British | 81 years |