| Alfred Roberts | Director | 12 Oct 1992 | 19 Sept 1997 | British | 81 years |
| Anke Groth | Director | 1 Jun 2016 | 30 May 2018 | German | 56 years |
| Anthony David Cocker | Director | 1 Jan 2004 | 4 Jul 2007 | British | 67 years |
| Anthony David Cocker | Director | 3 Oct 2011 | 31 Jul 2017 | British | 67 years |
| Anthony John Habgood | Director | 24 Nov 1993 | 31 Jan 2001 | British | 80 years |
| Brian Jefferson Tear | Director | 18 Mar 2008 | 12 Jun 2012 | British | 58 years |
| Burckhard Bergmann | Director | 10 Dec 2004 | 1 Dec 2007 | German | 83 years |
| Christian Barr | Director | 16 Jul 2018 | 31 Jul 2023 | German | 55 years |
| Colin Grieve Southgate | Director | 12 Oct 1992 | 15 Jul 1996 | British | 88 years |
| Colin Maxwell Short | Director | 30 May 1996 | 11 May 1999 | British | 92 years |
| David Dance | Director | 12 Oct 1992 | 30 Sept 1996 | British | 87 years |
| David Grahame Newborough | Director | 7 Aug 2013 | 30 Mar 2018 | British | 65 years |
| David John Jackson | Secretary | 12 Oct 1992 | 1 Jul 2002 | British | - |
| Deryk Irving King | Director | 1 Mar 1996 | 29 Jun 1998 | British,canadian | 79 years |
| Edmund Arthur Wallis | Director | 12 Oct 1992 | 19 Feb 2002 | British | 87 years |
| Erhard Walter Schipporeit | Director | 10 Dec 2004 | 6 Dec 2006 | German | 77 years |
| Fiona Scott Stark | Director | 21 Dec 2011 | 31 Dec 2016 | British | 64 years |
| Fiona Scott Stark | Secretary | 1 Jul 2002 | 31 Dec 2016 | British | - |
| Frederick Crawford | Director | 12 Oct 1992 | 19 Feb 2002 | British | 95 years |
| Graham John Bartlett | Director | 19 Feb 2002 | 3 Oct 2011 | British | 70 years |
| James Timothy Lightfoot | Director | 15 Jan 2015 | 8 Dec 2017 | British | 60 years |
| Jarri Edmund Sandstrom | Director | 1 Jan 2004 | 31 Mar 2008 | Swedish | 73 years |
| Johannes Teyssen | Director | 1 May 2007 | 1 Dec 2007 | German | 67 years |
| John Alan Thomas | Director | 30 May 1996 | 31 May 1999 | British | 83 years |
| John Anthony Gardiner | Director | 12 Oct 1992 | 31 Dec 1993 | British | 90 years |
| John Crackett | Director | 4 Jul 2007 | 1 Apr 2011 | British | 68 years |
| John Leonard Rennocks | Director | 12 Oct 1992 | 15 Jul 1996 | British | 81 years |
| Judson Graham Day | Director | 12 Oct 1992 | 7 Sept 1993 | British | 93 years |
| Kwok Po David Li | Director | 28 Jan 1998 | 19 Feb 2002 | British | 87 years |
| Maria Antoniou | Director | 1 Oct 2008 | 7 Aug 2013 | British | 61 years |
| Michael David Lewis | Director | 26 Apr 2017 | 31 May 2023 | British | 59 years |
| Michael Francis Reidy | Director | 12 Oct 1992 | 1 May 1996 | British | - |
| Michael Richard Hoffman | Director | 24 Nov 1993 | 17 Apr 1998 | British | 87 years |
| Michael Soehlke | Director | 1 Jul 2002 | 31 Dec 2003 | German | 67 years |
| Nicholas Peter Baldwin | Director | 25 Feb 1998 | 1 Jul 2002 | British | 74 years |
| Nicholas Wenham Horler | Director | 1 Jan 2004 | 31 Aug 2007 | British | 67 years |
| Paul Golby | Director | 19 Feb 2002 | 16 Dec 2011 | British | 75 years |
| Paul Myners | Director | 12 Oct 1992 | 15 Jul 1996 | British | 78 years |
| Peter Charles Fletcher Hickson | Director | 22 Jul 1996 | 1 Jul 2002 | British | 81 years |
| Powergen Directors Limited | Corporate Director | 1 Jul 2002 | 31 Dec 2003 | - | - |
| René Matthies | Director | 2 Jul 2012 | 31 May 2016 | German | 56 years |
| Robert Taylor | Director | 1 Jan 2004 | 1 Oct 2008 | British | 65 years |
| Roberto Quarta | Director | 16 Jul 1996 | 3 Aug 2001 | Italian American | 77 years |
| Roger Thomas Jump | Director | 12 Oct 1992 | 15 Jul 1996 | British | 83 years |
| Sara Lyn Vaughan | Director | 13 Feb 2013 | 26 Nov 2020 | British | 62 years |
| Sydney Gillibrand | Director | 31 May 1999 | 19 Feb 2002 | British | 92 years |
| Wulf Bernotat | Director | 1 Jan 2004 | 1 Dec 2007 | German | 78 years |