| Alan Andrew Barr | Director | 5 Feb 2007 | 31 Mar 2008 | British | 59 years |
| Amanda Eliza Mcmillan | Director | 28 Nov 2008 | 31 Jan 2018 | British | 57 years |
| Andrew James Cliffe | Director | 1 Jan 2023 | 28 Jan 2025 | British | 54 years |
| Andrew Richard Carlisle | Director | 27 Jan 2022 | 28 Jan 2025 | British | 58 years |
| David Edwards | Director | 12 May 2025 | 23 Sept 2025 | Canadian | 35 years |
| David John Kenny | Director | 1 Oct 2022 | 1 Apr 2023 | Australian | 50 years |
| Derek Provan | Director | 19 Jul 2018 | 1 Jan 2023 | British | 60 years |
| Donal Dowds | Director | 1 Aug 1999 | 1 Jan 2006 | Irish | 73 years |
| Donal Joseph Dowds | Director | 26 Jun 1989 | 1 Sept 1996 | Irish | 73 years |
| Fidel Lopez Soria | Director | 1 Nov 2010 | 8 Oct 2012 | Spanish | 59 years |
| Fidel Lopez Soria | Director | 18 Dec 2014 | 24 May 2016 | Spanish | 59 years |
| Gabrielle Mary Williams Hamer | Secretary | 31 Jan 1996 | 16 Sept 1997 | British | - |
| George Douglas Dewar | Director | 5 May 1993 | 5 Feb 2007 | British | 79 years |
| Gonzalo Velasco Zabalza | Director | 24 May 2016 | 28 Jan 2022 | Spanish | 47 years |
| Gonzalo Velasco Zabalza | Director | 27 Jan 2022 | 31 Dec 2022 | Spanish | 47 years |
| Gordon Ian Winston Parsons | Director | 13 Feb 2023 | 28 Jan 2025 | British | 59 years |
| Gordon William Dewar | Director | 5 Feb 2007 | 28 Nov 2008 | British | 60 years |
| Ignacio Aitor Garcia Bilbao | Director | 18 Dec 2014 | 26 Mar 2020 | Spanish | 56 years |
| Ignacio Castejon Hernandez | Director | 26 Mar 2020 | 30 Sept 2022 | Spanish | 49 years |
| James Christopher O'sullivan | Director | 8 Oct 2012 | 18 Dec 2014 | British | 67 years |
| John Kevin Bruen | Director | 18 Dec 2014 | 19 Dec 2022 | Irish | 54 years |
| Jonathan David Long | Director | 2 Sept 2013 | 18 Dec 2014 | British | 70 years |
| Jorge Lavin | Director | 24 Aug 2011 | 30 Aug 2013 | Spanish | 52 years |
| Madhulika Saraf | Director | 13 Feb 2023 | 28 Jan 2025 | British | 40 years |
| Maria Bernadette Lewis | Secretary | 16 Sept 1997 | 5 Oct 2005 | British | - |
| Maria Cristina Casero Borges | Director | 1 Apr 2023 | 21 Sept 2023 | Spanish | 66 years |
| Mark Iain Johnston | Director | 19 Jul 2018 | 2 Nov 2020 | British | 48 years |
| Miguel Rodera Onaderra | Director | 31 Dec 2022 | 28 Jan 2025 | Spanish | 45 years |
| Pablo Andres Monte | Director | 1 Apr 2008 | 30 Jun 2011 | Spanish | 53 years |
| Paul Jeremy Barlow | Director | 1 Sept 1996 | 30 Apr 2002 | British | 74 years |
| Peter John Lott | Secretary | 1 Mar 1995 | 15 Jun 1995 | British | - |
| Rachel Rowson | Secretary | 26 Jun 1989 | 1 Mar 1995 | British | - |
| Rachel Rowson | Secretary | 15 Jun 1995 | 31 Jan 1996 | British | - |
| Rachel Rowson | Secretary | 5 Oct 2005 | 1 Jun 2006 | British | - |
| Richard Abel | Director | 18 Dec 2014 | 8 Mar 2016 | British | 56 years |
| Robert Paterson Swan | Director | 1 Jan 1995 | 23 Feb 1995 | British | 66 years |
| Ronald Raymond Leitch | Director | 2 Nov 2020 | 28 Feb 2022 | British | 44 years |
| Shawn Michael Kinder | Director | 21 Sept 2023 | 28 Jan 2025 | American | 50 years |
| Shu Mei Ooi | Secretary | 28 Nov 2008 | 31 Aug 2010 | British | - |
| Simon Boyd Geere | Director | 8 Mar 2016 | 31 Dec 2023 | British | 58 years |
| Stephen Hedley Peat | Director | 31 Jul 2009 | 1 Nov 2010 | British | 71 years |
| Stephen Roy Baxter | Director | 1 Dec 2002 | 31 Dec 2007 | British | 61 years |
| Susan Welch | Secretary | 1 Jun 2006 | 28 Nov 2008 | British | - |
| Vernon Leslie Murphy | Director | 26 Jun 1989 | 1 Aug 1999 | British | 82 years |
