| Caroline Frances Corby | Director | 11 Nov 1997 | 20 Sept 2000 | British | 61 years |
| Christopher Mary Masterson | Director | 8 May 2000 | 17 Mar 2003 | British | 70 years |
| Christopher Paul Gill | Director | 16 Jan 2004 | 17 Nov 2008 | British | 69 years |
| Crispin Robert John Irvin | Director | 5 Apr 2017 | 16 Mar 2022 | British | 48 years |
| David Allan Farley | Director | 9 Jul 2001 | 17 Mar 2003 | British | 64 years |
| David George Hutchings | Director | 22 May 1992 | 11 Nov 1993 | British | 78 years |
| David Henry Burnett | Director | 15 Sept 2003 | 31 Mar 2006 | British | 75 years |
| David John Cavanna | Director | 29 Oct 2013 | 31 Dec 2015 | British | 59 years |
| David Stewart Casstles | Director | 22 May 1992 | 29 Mar 1996 | British | 90 years |
| Emil Hugh De Quervain | Director | 22 May 1992 | 17 Dec 1992 | British | 94 years |
| Emma Suzanne Ferley | Secretary | 23 Jun 2010 | 21 Feb 2012 | - | - |
| Frances Julie Niven | Secretary | 15 Jul 2005 | 25 Apr 2006 | British | - |
| George Royal Francis Hearne | Secretary | 22 May 1992 | 16 Feb 1998 | British | - |
| Ian Christopher Cotterill | Director | 17 Mar 2003 | 12 Sept 2003 | British | 78 years |
| Ian Mcclure Forrest | Director | 22 May 1992 | 2 May 2000 | British | 68 years |
| Jaya Subramaniyan | Director | 12 Mar 2009 | 29 Oct 2013 | Malaysian | 64 years |
| Jennifer Cole | Secretary | 6 Jul 2001 | 29 Aug 2003 | British | - |
| Larissa Wilson | Secretary | 27 Apr 2015 | 28 Apr 2017 | - | - |
| Lorna Youssouf | Secretary | 28 Apr 2017 | 11 Sept 2018 | - | - |
| Mathew Pearce | Director | 17 Mar 2022 | 5 Sept 2023 | British | 50 years |
| Michael Connelly Anderson | Director | 5 Jan 2016 | 22 Mar 2017 | British | 64 years |
| Michael James Kershaw | Director | 5 Aug 2013 | 7 Aug 2020 | British | 75 years |
| Nicola Carol Hopkins | Secretary | 25 Sept 2019 | 25 Feb 2022 | - | - |
| Paul Andrew Stafford | Secretary | 16 Feb 1998 | 6 Jul 2001 | British | - |
| Pauline Louise Mcquillan | Secretary | 25 Apr 2006 | 17 Oct 2008 | British | - |
| Philip Walter Goodwin | Director | 11 Sept 2000 | 17 Mar 2003 | British | 65 years |
| Rebecca Louise Poole | Secretary | 29 Aug 2003 | 15 Jul 2005 | British | - |
| Robert James Hinton | Secretary | 21 Feb 2012 | 20 Feb 2015 | - | - |
| Roger Anthony Frederick Heath | Director | 22 May 1992 | 31 Dec 1997 | British | 83 years |
| Romana Lewis | Secretary | 11 Sept 2018 | 25 Sept 2019 | - | - |
| Sarah Caroline Gott | Secretary | 17 Oct 2008 | 23 Jun 2010 | British | - |
| Susan Mary Haworth | Secretary | 16 Feb 1998 | 17 Mar 2003 | British | - |
| Victor John Blakemore Mansell | Director | 17 Mar 2003 | 29 Oct 2013 | British | 70 years |
| Vincent Gerald O'brien | Director | 21 Dec 1993 | 17 Mar 2003 | British | 68 years |