| Alastair Bruce Wallace | Director | 14 Nov 1988 | 21 Dec 2006 | British | 104 years |
| Alastair Bruce Wallace | Secretary | 14 Nov 1988 | 28 Oct 2005 | British | - |
| Alistair Bruce Boyd Mitchell | Director | 5 Jan 1989 | 21 Dec 2006 | British | 80 years |
| Alistair Bruce Boyd Mitchell | Secretary | 28 Oct 2005 | 21 Dec 2006 | British | - |
| Andrew Rolland Cunningham | Director | 21 Dec 2006 | 31 Dec 2015 | British | 70 years |
| Debra Rachel Yudolph | Director | 21 Dec 2006 | 19 Dec 2008 | British | 62 years |
| Helen Christine Gordon | Director | 31 Dec 2015 | 19 Jun 2023 | British | 67 years |
| John Douglas Wallace | Director | 14 Nov 1988 | 23 Jun 1989 | British | - |
| Marie Louise Glanville | Secretary | 21 Dec 2006 | 18 Dec 2008 | English | - |
| Mark Greenwood | Director | 7 Dec 2010 | 22 Dec 2015 | British | 67 years |
| Mark Jeremy Robson | Director | 21 Dec 2006 | 7 Jul 2010 | British | 67 years |
| Michael Patrick Windle | Secretary | 18 Dec 2008 | 4 Mar 2016 | British | - |
| Nicholas Mark Fletcher Jopling | Director | 7 Dec 2010 | 20 Dec 2017 | British | 65 years |
| Nicholas Peter On | Director | 23 Jan 2009 | 30 Sept 2016 | British | 63 years |
| Peter Quentin Patrick Couch | Director | 7 Dec 2010 | 31 Jan 2014 | British | 68 years |
| Robert Jan Hudson | Director | 25 Mar 2022 | 19 Jun 2023 | British | 53 years |
| Rupert Jerome Dickinson | Director | 21 Dec 2006 | 20 Oct 2009 | British | 67 years |
| Vanessa Kate Simms | Director | 11 Feb 2016 | 26 Apr 2021 | British | 51 years |