| Amanda Helen Bowe | Director | 31 Aug 2018 | 30 Apr 2024 | British | 58 years |
| Andrew David Briggs | Director | 1 Oct 2022 | 1 Feb 2025 | British | 60 years |
| Andrew Moss | Director | 10 Jun 2010 | 1 Oct 2022 | British | 62 years |
| Anthony Beverley Davidson | Director | 25 Nov 2009 | 12 Oct 2015 | British | 79 years |
| Anthony Charles Hotson | Director | 29 Nov 2002 | 15 Sept 2004 | British | 73 years |
| Anthony Wayne Snow | Director | 8 Aug 2013 | 15 Mar 2018 | British | 54 years |
| Arlene Cairns | Director | 1 Apr 2024 | 1 Feb 2025 | British | 48 years |
| Ashok Kumar Gupta | Director | 13 Apr 2005 | 6 May 2008 | British | 72 years |
| Bernard Andrew Curran | Director | 1 Oct 2020 | 1 Feb 2025 | British | 58 years |
| Brendan Joseph Meehan | Director | 1 Oct 2001 | 3 Jul 2003 | British | 68 years |
| Brid Mary Meaney | Director | 1 Apr 2021 | 19 Aug 2024 | Irish | 52 years |
| Colin David Lever | Director | 29 Jul 1999 | 31 Jul 2003 | British | 88 years |
| Craig William Dunn | Director | 18 Jul 2002 | 24 Sept 2002 | British | 63 years |
| David Charles Huntley | Director | 5 Jun 2008 | 2 Sept 2009 | British | 65 years |
| David Clemens Furness | Director | 23 May 1991 | 1 May 1992 | Australian | 90 years |
| David Louis Richardson | Director | 26 Apr 2012 | 31 Jan 2013 | Irish | 54 years |
| David Michael Gordon | Director | 23 May 1991 | 27 Dec 1994 | British | 86 years |
| David Richard Cheeseman | Director | 15 Sept 2017 | 17 Jul 2019 | British | 58 years |
| David Wyndham Davies | Director | 23 May 1991 | 30 Mar 1992 | British | 79 years |
| David Wyndham Davies | Director | 26 Aug 1994 | 31 Mar 1997 | British | 79 years |
| Diana Susan Miller | Director | 21 May 2015 | 31 Dec 2019 | British | 76 years |
| Duncan George Robin Ferguson | Director | 10 Sept 2004 | 31 Mar 2005 | British | 84 years |
| Geoffrey Delany | Director | 1 Dec 1994 | 28 Jul 1999 | British | 79 years |
| Geoffrey Delany | Secretary | 1 Oct 1993 | 17 Oct 2000 | British | - |
| George Rea Trumbull Iii | Director | 29 Jul 1999 | 24 Sept 1999 | American | 82 years |
| Gerald Alistair Watson | Secretary | 17 Oct 2000 | 15 Aug 2011 | British | - |
| Godfrey Edward Bowles | Director | 23 May 1991 | 31 Aug 1994 | British | 91 years |
| Hugh Edward Mark Osmond | Director | 13 Apr 2005 | 2 Sept 2009 | British | 64 years |
| Ian Adam Craston | Director | 1 Jun 2023 | 1 Feb 2025 | British | 60 years |
| Ian Claude Worner | Director | 23 May 1991 | 2 Dec 1994 | Australian | 89 years |
| Ian Donald Cormack | Director | 28 Apr 2005 | 10 Sept 2009 | British | 79 years |
| Ian Graham Maidens | Director | 10 Jul 2008 | 22 Aug 2008 | British | 62 years |
| Ian William Laughlin | Director | 28 Jan 2003 | 31 Mar 2006 | Australian | 75 years |
| James Daniel Gallagher | Director | 23 Jul 2020 | 30 Sept 2021 | British | 72 years |
| James Divers | Director | 27 Feb 1997 | 26 Feb 1999 | British | 77 years |
| Jean Craig Park | Director | 1 Apr 2010 | 19 Jun 2013 | British | 72 years |
| Joanna Elizabeth Varley | Director | 23 Jul 2001 | 9 Oct 2001 | British | 61 years |
| John Robert Cusins | Director | 6 Sept 2005 | 2 Sept 2009 | British | 54 years |
| John Robert Lister | Director | 1 Sept 2016 | 1 Feb 2025 | British | 68 years |
| John Robert Simmonds | Director | 23 Jul 2001 | 10 Oct 2001 | British | 69 years |
| John Simon Bertie Smith | Director | 31 Mar 2006 | 25 Mar 2010 | British | 62 years |
| Jonathan James Yates | Director | 24 Jun 2010 | 21 Dec 2011 | British | 65 years |
| Jonathan Peter Evans | Director | 28 Apr 2005 | 10 Sept 2009 | British | 76 years |
| Jonathan Peter Evans | Director | 2 Nov 2009 | 31 Aug 2016 | British | 76 years |
| Jonathan Robson Pears | Director | 31 Aug 2018 | 1 Oct 2022 | British | 58 years |
| Jonathan Stephen Moss | Director | 3 Jul 2003 | 6 Oct 2009 | British | 63 years |
| Jora Singh Gill | Director | 1 Jun 2023 | 1 Feb 2025 | British | 61 years |
| Karin Alexandra Cook | Director | 1 May 2024 | 1 Feb 2025 | British | 60 years |
| Kerr Luscombe | Director | 20 Oct 2009 | 9 Feb 2010 | British | 61 years |
| Malcolm Rowland Bates | Director | 29 Jul 1999 | 28 Feb 2005 | British | 92 years |
| Manjit Dale | Director | 13 Apr 2005 | 2 Sept 2009 | British | 61 years |
| Marc Joseph De Cure | Director | 21 Feb 2001 | 15 Oct 2002 | Australian | 68 years |
| Margaret Grace Hassall | Director | 23 Jul 2020 | 31 Mar 2023 | British | 65 years |
| Marianne Fitzjohn | Director | 23 Jul 2001 | 9 Oct 2001 | Danish | 60 years |
| Michael David Ross | Director | 28 Apr 2005 | 31 Mar 2016 | British | 80 years |
| Michael John Eakins | Director | 23 Jul 2020 | 1 Oct 2022 | Irish | 51 years |
| Michael John Merrick | Director | 30 Dec 2008 | 19 May 2014 | British | 66 years |
| Michael Norris Urmston | Director | 18 Jan 2010 | 31 Oct 2021 | British | 77 years |
| Nicholas Hugh Poyntz-wright | Director | 3 May 2016 | 31 Dec 2024 | British | 63 years |
| Paul John Batchelor | Director | 19 Aug 1999 | 24 Sept 2002 | Australian | 76 years |
| Peter John Costain | Director | 29 Jul 1999 | 28 Feb 2005 | British | 88 years |
| Peter Kane Mayes | Director | 1 Oct 2022 | 31 Mar 2024 | British | 55 years |
| Peter Stafford Carr | Director | 7 Jun 2000 | 4 Apr 2001 | British | 79 years |
| Peter Thomas Johnson | Director | 23 Jun 1999 | 11 Apr 2000 | British | 72 years |
| Philip Richard Simmons | Director | 1 Dec 1994 | 1 Nov 1996 | British/can/austln | 77 years |
| Philip Wynford Moore | Director | 21 Feb 2001 | 15 Oct 2002 | British | 66 years |
| Rakesh Kishore Thakrar | Director | 23 Jul 2018 | 15 May 2020 | British | 51 years |
| Rakesh Kishore Thakrar | Director | 1 Oct 2022 | 31 Jul 2024 | British | 51 years |
| Richard Charles Surface | Director | 31 Jan 1995 | 23 Jun 1999 | American | 78 years |
| Richard David Houghton | Director | 31 Aug 2018 | 31 Dec 2019 | British | 61 years |
| Robin Wilfrid Bevitt | Director | 23 May 1991 | 30 Sept 1993 | British | 95 years |
| Robin Wilfrid Bevitt | Secretary | 23 May 1991 | 30 Sept 1993 | British | - |
| Rodney Malcolm Cook | Director | 8 Jul 1999 | 2 Jul 2001 | Australian British | 69 years |
| Rosemary Harris | Director | 1 Jan 2022 | 1 Feb 2025 | British | 68 years |
| Shamira Mohammed | Director | 7 Oct 2014 | 26 Jun 2017 | British | 58 years |
| Simon Charles True | Director | 2 Sept 2013 | 9 Mar 2018 | British | 58 years |
| Stephen Andrew Clarke | Director | 12 Oct 2015 | 1 Oct 2022 | British | 72 years |
| Stephen Keith Percival | Director | 17 Jul 2019 | 31 Mar 2021 | British | 51 years |
| Susan Davidson Mcinnes | Director | 18 Apr 2018 | 31 Aug 2018 | British | 64 years |
| Terence George Shrimpton | Director | 14 Sept 1995 | 15 Dec 2000 | British | 84 years |
| Thomas Aird Fraser | Director | 15 Jan 2001 | 2 Nov 2002 | Australian | 67 years |
| Timothy Cardwell Wade | Director | 23 Jul 2001 | 9 Oct 2001 | Australian | 67 years |
| Timothy Walter Harris | Director | 1 May 2022 | 1 Feb 2025 | British | 57 years |
| Tom Cross Brown | Director | 28 Apr 2005 | 10 Sept 2009 | English | 79 years |
| Trevor James Thompson | Director | 23 Jul 2001 | 10 Oct 2001 | Australian | 81 years |
| William Henry Weston Wells | Director | 29 Jul 1999 | 31 Mar 2005 | British | 86 years |
| William Malcolm Hodgkinson | Director | 1 May 1992 | 30 Jun 1995 | Australian/british | 88 years |
| William Raymond Treen | Director | 28 Apr 2005 | 21 May 2015 | Welsh | 86 years |