| Andrew Ian Silver | Director | 2 Mar 2011 | 12 May 2014 | British | 61 years |
| Angela Margaret Mcclintock | Director | 3 Jan 2006 | 25 May 2012 | British | 57 years |
| Benedict Watling | Director | 31 Dec 1991 | 29 May 2013 | British | 62 years |
| Damian Jon Stevenson | Director | 22 Apr 2014 | 28 Feb 2017 | British | 59 years |
| Graeme Wilkes | Director | 5 Apr 2017 | 31 Jan 2025 | British | 65 years |
| John Kevin O'dowd | Director | 1 Feb 2013 | 18 Nov 2013 | British | 67 years |
| Jonathan Christopher Lowe | Director | 1 Jul 2015 | 3 Sept 2021 | British | 62 years |
| Lee Jon Ali | Director | 3 Jul 2017 | 24 Sept 2021 | British | 48 years |
| Lee Jon Ali | Secretary | 3 Jul 2017 | 24 Sept 2021 | - | - |
| Lisa Marie Davidson | Director | 5 Apr 2017 | 31 Dec 2021 | British | 51 years |
| Lucy Victoria Winwood Armstrong | Director | 21 Dec 2012 | 24 Apr 2020 | British | 58 years |
| Mark Russell Dempsey | Director | 16 Jan 2008 | 31 Oct 2013 | British | 60 years |
| Mark Russell Dempsey | Secretary | 16 Jan 2008 | 31 Oct 2013 | British | - |
| Matthew James Marshall | Director | 25 Jan 2018 | 31 Jul 2018 | British | 59 years |
| Michael Dennis Parsons | Director | 21 Jan 2015 | 29 Sept 2021 | British | 76 years |
| Robert Francis Fleck | Director | 31 Dec 1991 | 21 Feb 1992 | British | 64 years |
| Roger Charles Queen | Director | 2 Apr 2008 | 28 Nov 2012 | British | 62 years |
| Rosalind Whitehead | Secretary | 31 Dec 1991 | 22 Sept 2003 | British | - |
| Sarah Watling | Secretary | 22 Sept 2003 | 16 Jan 2008 | British | - |
| Simon Leo Belfer | Director | 9 Feb 2022 | 17 Mar 2023 | British | 63 years |
| Timothy Stephen Bartlett | Director | 26 Apr 2023 | 26 Jan 2024 | British | 54 years |