| Andrea Margaret Blance | Director | 12 Apr 2013 | 30 Oct 2014 | British | 62 years |
| Andrew David Fairhurst | Secretary | 1 Oct 2002 | 8 Jan 2007 | British | - |
| Andrew David Fairhurst | Nominee Secretary | 31 Aug 2008 | 4 May 2010 | Other | - |
| Andrew William Palmer | Director | 27 Jun 1994 | 1 Sept 2009 | British | 73 years |
| Anthony John Hobson | Director | 30 May 1992 | 28 Feb 2001 | British | 79 years |
| Carol Ann Dockrell | Secretary | 19 Mar 1996 | 31 Dec 2001 | British | - |
| Catherine Laura Mason | Director | 13 Apr 2018 | 29 Jun 2021 | British | 50 years |
| Catherine Rosemary Reid Avery | Director | 17 Aug 1999 | 28 Jan 2009 | British | 66 years |
| Charles Peter Peal | Director | 1 Jan 1998 | 27 Jun 2000 | British | 72 years |
| Christian Wilhelm Tore Dinesen | Director | 1 Apr 2016 | 28 Jul 2025 | Danish | 65 years |
| Christopher Charles Hatry | Director | 29 Apr 1993 | 14 Nov 2006 | British | 77 years |
| Christopher James Knight | Director | 17 Jan 2014 | 1 Apr 2016 | British | 58 years |
| Christopher Joseph Hairs | Director | 30 May 1992 | 30 Jun 1997 | British | 83 years |
| Claire Anne Davies | Secretary | 8 Jan 2007 | 31 Aug 2008 | Other | - |
| Clare Frances Carson | Secretary | 31 Dec 2001 | 1 Oct 2002 | British | - |
| Colin Charles Harris | Director | 30 May 1992 | 28 Jun 1996 | British | 82 years |
| David John Prosser | Director | 30 May 1992 | 31 Dec 2005 | British | 82 years |
| David Rough | Director | 30 May 1992 | 31 Dec 2001 | British | 75 years |
| Duncan Alistair Finch | Director | 19 Feb 2014 | 1 Apr 2016 | British | 61 years |
| Edward Christie | Director | 30 May 1992 | 5 Jun 1998 | British | 88 years |
| Gareth John Hoskin | Director | 17 Aug 1999 | 31 Oct 2012 | British | 66 years |
| Ian Andrew Gibson | Director | 15 Oct 2002 | 31 Dec 2004 | British | 77 years |
| Jacqueline Dorothy Mary Noakes | Director | 21 Jul 2014 | 1 Apr 2016 | Irish | 65 years |
| James Michael Bury | Director | 24 Sept 2009 | 20 Apr 2015 | British | 65 years |
| Jamshaid Islam | Director | 14 Mar 2014 | 20 Apr 2015 | British | 51 years |
| John Brackenridge Pollock | Director | 11 Dec 2003 | 21 May 2015 | British | 68 years |
| John Bryan Craddock | Director | 30 May 1992 | 30 Jun 1993 | British | 93 years |
| John Martin Maccarthy | Director | 1 Jan 1998 | 31 Dec 2001 | British | 81 years |
| Kerrigan William Procter | Director | 17 Jan 2014 | 1 Apr 2016 | British | 57 years |
| Kevin Murphy | Director | 1 Apr 2016 | 6 Dec 2024 | Irish | 75 years |
| Mark Julian Gregory | Director | 1 Jan 2002 | 11 Dec 2003 | British | 63 years |
| Mark Julian Gregory | Director | 14 Nov 2006 | 9 Mar 2017 | British | 63 years |
| Michael John Bolton | Director | 20 Jul 1993 | 11 Nov 1994 | British | 76 years |
| Michael John Bolton | Director | 1 Jul 1997 | 24 Jun 2010 | British | 76 years |
| Nigel David Wilson | Director | 1 Sept 2009 | 31 Dec 2023 | British | 70 years |
| Pamela Rose Raynor | Director | 30 May 1992 | 11 Nov 1994 | British | 74 years |
| Paul Edward Glen | Director | 5 Jun 1998 | 13 Jul 1999 | British | 66 years |
| Robin Ashley Phipps | Director | 29 Apr 1993 | 13 Jul 2007 | British | 76 years |
| Thomas Andrew Forwood Smith | Secretary | 23 Aug 1993 | 19 Mar 1996 | British | - |
| Timothy James Breedon | Director | 19 Sept 2000 | 30 Jun 2012 | British | 68 years |
| Vijay Subramanyam Ayer | Secretary | 30 May 1992 | 23 Aug 1993 | British | - |
| William Mervyn Abbott | Director | 30 May 1992 | 11 Nov 1994 | British | 84 years |