| Amanda Eliza Mcmillan | Director | 18 Dec 2014 | 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 |
| Andrew Tadeusz Jurenko | Director | 18 Feb 1999 | 30 Sept 2006 | British | 76 years |
| Anthony John West | Director | 1 Apr 1997 | 1 Aug 1997 | British | 87 years |
| Barry Eric Kirk Horrell | Director | 1 Apr 1997 | 1 Apr 1999 | British | 67 years |
| Barry Eric Kirk Horrell | Director | 1 Apr 2000 | 31 Jan 2002 | British | 67 years |
| Brian Hugh Ricketts | Director | 1 Apr 1997 | 1 Apr 1999 | British | 83 years |
| Brian Robert Woodhead | Director | 1 Sept 2014 | 18 Dec 2014 | British | 66 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 |
| Duncan Steven Garrood | Director | 30 Sept 2006 | 23 Feb 2009 | British | 68 years |
| Fidel Lopez Soria | Director | 8 Oct 2012 | 1 Sept 2014 | Spanish | 59 years |
| Fidel Lopez Soria | Director | 18 Dec 2014 | 24 May 2016 | Spanish | 59 years |
| Gabrielle Mary Williams Hamer | Secretary | 4 Mar 1997 | 16 Sept 1997 | British | - |
| George Gordon Edington | Director | 4 Mar 1997 | 8 Mar 1999 | British | 81 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 |
| Howard Barry Morgan | Director | 1 Apr 1997 | 31 Oct 1998 | British | 69 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 |
| Jeremy Charles Bailey Boyes | Director | 1 Aug 1997 | 1 Apr 1999 | British | 78 years |
| Jeremy Charles Bailey Boyes | Director | 15 Jan 2001 | 29 Jul 2008 | British | 78 years |
| John Kevin Bruen | Director | 18 Dec 2014 | 19 Dec 2022 | Irish | 54 years |
| John Leopold Egan | Director | 1 Apr 1997 | 7 Nov 1999 | British | 87 years |
| John Russell Fotheringham Walls | Director | 1 Apr 1997 | 31 Aug 2002 | British | 82 years |
| John Stephen O'halloran | Director | 1 Apr 1997 | 31 Jul 2009 | Irish | 74 years |
| John William Holland Kaye | Director | 31 Jul 2009 | 8 Oct 2012 | British | 61 years |
| Jonathan Vezey Strong | Director | 1 Apr 1997 | 18 Feb 1999 | British | 77 years |
| Madhulika Saraf | Director | 13 Feb 2023 | 28 Jan 2025 | British | 40 years |
| Maria Bernadette Lewis | Secretary | 16 Sept 1997 | 9 Nov 2005 | British | - |
| Maria Cristina Casero Borges | Director | 1 Apr 2023 | 21 Sept 2023 | Spanish | 66 years |
| Michael James Roberts | Director | 1 Jul 1997 | 1 Apr 1999 | British | 81 years |
| Michael Marshall | Director | 4 Mar 1997 | 5 Aug 1999 | British | 76 years |
| Michael Stewart Hodgkinson | Director | 1 Oct 1999 | 8 Jun 2003 | British | 82 years |
| Miguel Rodera Onaderra | Director | 31 Dec 2022 | 28 Jan 2025 | Spanish | 45 years |
| Normand Boivin | Director | 1 Sept 2014 | 18 Dec 2014 | Canadian | 65 years |
| Rachel Rowson | Secretary | 9 Nov 2005 | 1 Jun 2006 | British | - |
| Richard Abel | Director | 18 Dec 2014 | 8 Mar 2016 | British | 56 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 |
| Simon O`donnell | Director | 1 Apr 1997 | 31 Mar 1999 | British | 74 years |
| Stephen Wilkinson | Director | 31 Jul 2009 | 18 Dec 2014 | British | 68 years |
| Susan Welch | Secretary | 1 Jun 2006 | 28 Nov 2008 | British | - |
| Terence David Morgan | Director | 1 Apr 1997 | 1 Jul 1997 | British | 70 years |