| Barbara Plucnar Jensen | Director | 3 Oct 2016 | 28 Feb 2019 | Danish | 55 years |
| Bruce Andrew Van Der Waag | Director | 13 May 2019 | 22 Oct 2021 | Dutch | 60 years |
| Corinne Gethin | Director | 7 Dec 2001 | 27 Oct 2010 | British | 64 years |
| Corinne Gethin | Secretary | 7 Dec 2001 | 31 Oct 2010 | British | - |
| David John Bower | Secretary | 9 Feb 1995 | 7 Dec 2001 | British | - |
| Hedley Stuart Stroud | Director | 30 Aug 1991 | 7 Dec 2001 | British | 71 years |
| Hedley Stuart Stroud | Secretary | 30 Aug 1991 | 28 Feb 1995 | British | - |
| Jorn Vestergaard | Director | 1 Jun 2015 | 3 Oct 2016 | Danish | 58 years |
| Matthew Edward Stanley Brabin | Director | 28 Apr 2009 | 13 Nov 2015 | British | 61 years |
| Matthew Edward Stanley Brabin | Director | 1 Aug 2016 | 16 Jun 2020 | British | 61 years |
| Michael Adrian Taylor | Director | 30 Aug 1991 | 27 Mar 2002 | British | 83 years |
| Philip John Leigh | Director | 28 Feb 2019 | 28 Feb 2021 | British | 59 years |
| Purvin Kumar Madhusudan Patel | Director | 16 Jun 2020 | 23 Dec 2020 | British | 53 years |
| Richard Ian Sykes | Director | 12 Mar 2012 | 1 Aug 2016 | British | 56 years |
| Robert David Openshaw | Director | 7 Dec 2001 | 27 Oct 2010 | British | 77 years |
| Stephanie Louise Hamilton | Director | 22 Feb 2021 | 31 Jul 2021 | British | 55 years |
| Stuart Ernest Albert Stroud | Director | 30 Aug 1991 | 7 Dec 2001 | British | 101 years |