| Amanda Jane Burton | Director | 1 Jul 2005 | 16 Sept 2014 | British | 66 years |
| Andrew Frank Sturgess | Director | 2 Jan 2003 | 31 Mar 2007 | British | 75 years |
| Andrew James Duxbury | Director | 26 Mar 2019 | 31 May 2024 | British | 50 years |
| Andrew Mark Jenner | Director | 1 Jan 2009 | 10 Nov 2017 | British | 56 years |
| Anthony Peter Betney | Director | 7 Oct 1993 | 31 Mar 1998 | British | 86 years |
| Barry Kenneth Luckett | Director | 15 Sept 2000 | 21 Jan 2002 | British | 83 years |
| Christopher David Bucknall | Director | 15 Sept 2000 | 7 Nov 2008 | British | 75 years |
| Christopher King | Director | 1 Jul 1998 | 30 May 2003 | British | 71 years |
| David Calverley | Director | 15 Sept 2000 | 30 Jun 2011 | British | 84 years |
| Eric Geoffrey Flower | Director | 6 Dec 1991 | 7 Oct 1993 | British | 89 years |
| Francis Eamon Nelson | Director | 15 Sept 2000 | 30 Sept 2012 | British | 74 years |
| Gavin Slark | Director | 13 May 2015 | 23 Jan 2020 | British | 60 years |
| George Robert Marsh | Director | 6 Dec 1991 | 31 Oct 2002 | British | 76 years |
| Gordon Lindsay Taylor | Director | 6 Dec 1991 | 31 Mar 1997 | British | 93 years |
| Graham Prothero | Director | 1 Feb 2013 | 3 Jan 2020 | British | 64 years |
| Greg Paul Fitzgerald | Director | 1 Jul 2003 | 11 Nov 2016 | British | 61 years |
| Horace Anthony Palmer | Director | 14 Jul 1999 | 28 Oct 2005 | British | 88 years |
| Hugh William Try | Director | 15 Sept 2000 | 31 Dec 2003 | British | 88 years |
| Ian David Coull | Director | 8 Nov 2010 | 21 Oct 2014 | British | 75 years |
| Ishbel Jean Stewart Macpherson | Director | 1 Feb 2014 | 9 Nov 2017 | British | 65 years |
| Jeremy Charles Douglas Townsend | Director | 1 Sept 2017 | 23 Jan 2020 | British | 61 years |
| John Arthur Bower | Secretary | 26 Aug 1992 | 8 May 1998 | British | - |
| John Livingston | Director | 6 Dec 1991 | 15 Sept 2000 | British | 82 years |
| John Livingston | Secretary | 26 Jun 1992 | 26 Aug 1992 | British | - |
| John Malcolm Wardle | Director | 6 Dec 1991 | 26 Nov 1992 | British | 96 years |
| Jonathan Donald Sherlock Dawson | Director | 1 Jan 2004 | 31 Dec 2008 | British | 73 years |
| Kenneth Gillespie | Director | 31 Mar 2006 | 31 Mar 2007 | British | 60 years |
| Kenneth Gillespie | Director | 1 Mar 2013 | 31 Jul 2016 | British | 60 years |
| Kenneth John Firman | Director | 1 Apr 1993 | 30 Jun 1996 | British | 94 years |
| Maria Luisa Cassoni | Director | 1 Sept 2018 | 23 Jan 2020 | British | 74 years |
| Michael Anthony Noble | Director | 1 May 1996 | 30 Jun 2003 | British | 76 years |
| Michael Jackson | Director | 1 Apr 1997 | 29 Oct 2004 | British | 77 years |
| Paul Anthony Davies | Secretary | 11 May 1998 | 15 Sept 2000 | British | - |
| Peter Galliford | Director | 6 Dec 1991 | 29 Oct 1999 | British | 97 years |
| Peter John Ventress | Director | 30 Apr 2015 | 23 Jan 2020 | British | 65 years |
| Peter Lloyd Rogers | Director | 1 Jul 2008 | 30 Apr 2015 | British | 78 years |
| Peter Martin Truscott | Director | 1 Oct 2015 | 26 Mar 2019 | British | 63 years |
| Richard Barraclough | Secretary | 15 Sept 2000 | 29 Feb 2012 | British | - |
| Richard Michael Miles | Director | 6 Dec 1991 | 29 Oct 1999 | British | 91 years |
| Roger Galsworthy Williams | Secretary | 6 Dec 1991 | 26 Jun 1992 | British | - |
| Therese Lynn Miller | Director | 1 Feb 2014 | 23 Jan 2020 | British | 74 years |