| Alan James Harris Stewart | Director | 1 Nov 2010 | 10 Jul 2014 | British | 66 years |
| Alison Clare Reed | Director | 6 Dec 2001 | 30 Apr 2005 | British | 70 years |
| Amanda Mellor | Director | 30 Jul 2009 | 1 Feb 2019 | British | 62 years |
| Andrew Robert Findlay | Director | 5 Mar 2009 | 31 Jan 2011 | British | 57 years |
| Andrew Scott Holmes | Director | 17 Nov 2017 | 26 Apr 2019 | British | 51 years |
| David Ronald Norgrove | Director | 16 Oct 2000 | 31 Mar 2004 | British | 78 years |
| Derek Keith Hayes | Director | 10 Mar 1998 | 31 May 1999 | British | 78 years |
| Eoin Philip Tonge | Director | 26 Jun 2020 | 19 Jan 2023 | Irish | 54 years |
| Graham John Oakley | Director | 31 Mar 2004 | 1 Sept 2009 | British | 70 years |
| Graham John Oakley | Secretary | 28 May 1992 | 10 Mar 1998 | British | - |
| Helen Alison Weir | Director | 5 Jun 2015 | 31 Mar 2018 | British | 64 years |
| Humphrey Stewart Morgan Singer | Director | 7 Sept 2018 | 31 Dec 2019 | British | 61 years |
| Ian Dyson | Director | 27 Jun 2005 | 14 Jul 2010 | British | 64 years |
| Jeremy Charles Douglas Townsend | Director | 19 Jan 2023 | 21 May 2025 | British | 62 years |
| John Keith Oates | Director | 28 May 1992 | 31 Jan 1999 | British | 84 years |
| Jurgen Kriebel | Director | 10 Jul 2015 | 17 Nov 2017 | German | 56 years |
| Marc Bolland | Director | 14 Jul 2010 | 7 Feb 2011 | Dutch | 67 years |
| Nigel Lawrence Colne | Director | 28 May 1992 | 10 Mar 1998 | British | 86 years |
| Patricia Howell | Secretary | 8 Feb 2018 | 31 Aug 2022 | - | - |
| Paul Allan Friston | Director | 10 Jul 2014 | 5 Jun 2015 | British | 53 years |
| Philip Guy Mccracken | Director | 1 Feb 1999 | 16 Oct 2000 | British | 78 years |
| Richard Greenbury | Director | 28 May 1991 | 31 Jan 1999 | British | 90 years |
| Robert John Ivens | Secretary | 10 Mar 1998 | 16 Sept 2016 | British | - |
| Robert William Chaigneau Colvill | Director | 1 Feb 1999 | 31 Dec 2001 | British | 86 years |
| Scilla Grimble | Director | 31 Mar 2018 | 14 Sept 2018 | British | 53 years |
| Susan Elizabeth Harris | Director | 26 May 2005 | 31 Aug 2005 | British | 65 years |
| Verity Chase | Secretary | 16 Sept 2016 | 8 Feb 2018 | - | - |