| Alexandra Mary Moffatt | Director | 14 Nov 2018 | 31 Dec 2020 | British | 46 years |
| Andrew John Bowman | Director | 23 Oct 2014 | 10 Feb 2017 | British | 54 years |
| Andrew John Bowman | Director | 5 Mar 2018 | 3 Jul 2018 | British | 54 years |
| Angus Smith | Director | 24 Apr 2006 | 22 Oct 2008 | British | 63 years |
| Ann Hird | Director | 23 Apr 2012 | 15 Nov 2012 | British | 69 years |
| Anthony Nicholas Greatorex | Director | 18 Mar 2014 | 17 Apr 2015 | British | 58 years |
| Antony Vincent Holt | Director | 22 Oct 2008 | 23 Apr 2012 | British | 67 years |
| Chandrasekhar Ramamurthy | Director | 19 Jun 2019 | 31 Mar 2022 | British | 70 years |
| Chantal Free | Director | 26 Feb 2020 | 30 Jun 2021 | British | 58 years |
| Charles Horwood Carrick | Director | 1 Jun 1999 | 24 Apr 2001 | British | 57 years |
| Charles Horwood Carrick | Director | 21 Nov 2001 | 20 Feb 2006 | British | 57 years |
| Charles Horwood Carrick | Director | 1 Dec 2007 | 4 Aug 2008 | British | 57 years |
| Christopher Dunkerley | Director | 1 Aug 1994 | 31 May 1995 | British | 75 years |
| Cory Lane Moulton | Director | 27 Jun 1997 | 31 Dec 1999 | American | 57 years |
| David Kenneth Thoms | Director | 14 Oct 1991 | 4 Nov 1994 | British | 82 years |
| David Kenneth Thoms | Secretary | 14 Oct 1991 | 4 Nov 1994 | British | - |
| David Lawrence Samuel | Director | 20 Dec 1994 | 31 Mar 1999 | British | 62 years |
| David Lawrence Samuel | Secretary | 4 Nov 1994 | 31 Mar 1999 | British | - |
| Erika Bannerman | Director | 9 May 2019 | 7 Aug 2019 | British | 55 years |
| Gareth Pickles | Director | 24 Oct 2018 | 31 Jul 2019 | British | 59 years |
| Garth Russell Bearman | Director | 14 Oct 1991 | 14 Feb 1997 | British | 80 years |
| Graham James Farmer | Director | 23 Oct 1997 | 1 Dec 2007 | British | 77 years |
| Henry Ian Knipe | Director | 14 Oct 1991 | 30 Jun 1994 | British | 81 years |
| Ian Edward Jarvis | Director | 3 Jan 2014 | 23 Mar 2016 | British | 55 years |
| James D'arcy Vincent | Director | 22 May 2015 | 16 May 2017 | British | 60 years |
| James Royston Carlton | Director | 1 Aug 1994 | 4 Aug 2008 | British | 72 years |
| Jennifer Ann Yates | Director | 20 Jan 2004 | 20 Feb 2006 | British | 59 years |
| Jeremy Peter Small | Secretary | 22 Dec 2008 | 23 Apr 2012 | British | - |
| Jesper Groenvold | Director | 1 May 2003 | 20 Feb 2006 | Danish | 69 years |
| Jonathan Richard William Evans | Director | 7 Jun 2000 | 20 Feb 2006 | British | 63 years |
| Jonathan Richard William Evans | Secretary | 31 Mar 2000 | 24 Apr 2006 | British | - |
| Maxwell Edward Lesser | Director | 1 Jun 1999 | 31 Mar 2000 | British | 62 years |
| Maxwell Edward Lesser | Secretary | 1 Jun 1999 | 31 Mar 2000 | British | - |
| Michael Alexander Gardiner Whitfield | Director | 1 Nov 1991 | 31 Jan 1996 | British | 68 years |
| Michael Pallewala Samara | Director | N/A | 30 Apr 1997 | British | 73 years |
| Niall John Mccallum | Director | 10 May 2017 | 15 Sept 2017 | British | 52 years |
| Nicholas Edward Latner | Director | 1 Apr 2017 | 31 Oct 2018 | British | 48 years |
| Nicholas George Robert Harris | Director | 23 Aug 2004 | 20 Feb 2006 | British | 52 years |
| Nicholas John Percival | Director | 20 Dec 1994 | 6 Sept 1995 | British | 65 years |
| Nicholas Mackenzie Herbert Burns | Director | 27 Jun 2008 | 26 Jun 2015 | British | 59 years |
| Nicholas Robert Arnott Sutton | Director | 20 Dec 1994 | 31 May 1995 | British | 62 years |
| Nicolas Norman Bedford | Director | 23 Apr 2012 | 4 May 2012 | British | 67 years |
| Nicolas Norman Bedford | Director | 9 Feb 2017 | 1 Feb 2018 | British | 67 years |
| Nigel Jeffrey Purveur | Director | 14 Jan 2020 | 2 Jan 2021 | British | 72 years |
| Peter Anthony Evans | Director | 1 Jun 1999 | 17 Apr 2003 | British | 66 years |
| Peter Gray | Director | 24 Apr 2006 | 31 Mar 2010 | British | 80 years |
| Peter Marcus Telford | Director | 9 Oct 2018 | 27 Sept 2019 | British | 69 years |
| Philip John Anderson | Director | 1 Jun 2009 | 23 Apr 2012 | British | 62 years |
| Robert Michael James Atkinson | Director | 16 Jan 1995 | 27 Jun 1997 | British | 73 years |
| Simon Edward Hall | Director | 10 Jun 2016 | 10 Feb 2017 | British | 51 years |
| Simon James Sherwood Mayall | Director | 11 Dec 2017 | 14 Aug 2020 | British | 59 years |
| Simon Lawrence Vernon Cole | Secretary | 24 Apr 2006 | 22 Dec 2008 | British | - |
| Simon Newton | Director | 14 Jun 2021 | 31 Dec 2021 | British | 63 years |
| Stephen Sharp | Director | 23 Apr 2012 | 3 Feb 2014 | British | 61 years |
| Susan Lesley Ring | Director | 17 Jan 2014 | 20 Jul 2018 | British | 65 years |
| Tobin John Jagoe Roberts | Director | 14 Oct 1991 | 30 Apr 1996 | British | 68 years |
| Vanda Suzanne Cox | Director | 1 Aug 1994 | 17 Jul 1998 | British | 67 years |
| William Dickson Farmer | Director | 22 Jun 2000 | 14 Jun 2001 | American | 71 years |