| Adrian Peter Brown | Director | 22 Jun 1993 | 21 Jan 2000 | British | 61 years |
| Adrian Peter Brown | Director | 19 May 2000 | 29 May 2007 | British | 61 years |
| Adrian Peter Brown | Secretary | N/A | 23 Mar 1994 | British | - |
| Anne Kennedy | Secretary | 23 Mar 1994 | 26 Jun 1997 | British | - |
| Bernadette Clare Young | Secretary | 18 Dec 2000 | 1 May 2001 | British | - |
| Brian John Hall | Director | 19 May 2000 | 1 May 2001 | British | 74 years |
| Catherine Coveney | Director | N/A | 4 Jul 1997 | British | 64 years |
| Charles Gordon Hannah | Director | N/A | 24 Jan 1994 | British | 74 years |
| David Blyth Morris | Director | 3 Feb 2003 | 15 Dec 2003 | British | 74 years |
| David Frederick Frost | Director | 28 Apr 1995 | 21 Jun 1995 | British | 74 years |
| David Patrick Coughlan | Director | 29 Aug 2018 | 29 Apr 2019 | Irish | 54 years |
| Duncan Alistair Finch | Director | 3 Feb 2003 | 8 Mar 2007 | British | 61 years |
| Edward George Fitzgerald Hannan | Director | 21 Oct 2016 | 1 Jun 2017 | British | 48 years |
| Elinor Sarah Bell | Director | 14 Nov 2014 | 18 Dec 2015 | British | 57 years |
| Francis David Booth | Director | 21 Jan 2000 | 19 May 2000 | British | 73 years |
| George Andrew Town | Director | N/A | 31 Jul 1998 | British | 82 years |
| George Stephan Pater | Director | 1 May 2001 | 10 Jul 2002 | British | 75 years |
| George Stephan Pater | Director | N/A | 4 Jul 1997 | British | 75 years |
| Heather Gwendolyn Brierley | Secretary | 15 Sept 2000 | 18 Dec 2000 | British | - |
| Iain Michael Robson | Director | 19 May 2000 | 28 Nov 2003 | British | 67 years |
| Jacqueline Elizabeth Fox | Secretary | 10 Jul 2002 | 9 Dec 2005 | British | - |
| Jane Wendy Evans | Director | N/A | 4 Oct 1994 | British | 74 years |
| John Hilton Berg | Secretary | 31 Jul 1998 | 15 Sept 2000 | British | - |
| John Michael Mills | Director | 20 Jan 2011 | 14 Nov 2014 | British | 62 years |
| Jonathan Philip Wilson-brown | Director | 11 May 2016 | 5 Aug 2016 | British | 55 years |
| Kay Alison Martin | Director | 23 Jul 2020 | 31 Jul 2022 | British | 59 years |
| Kenneth Andrew Leitch | Director | 29 Aug 2018 | 31 Dec 2021 | British | 62 years |
| Louisa Jane Leonard | Director | 1 Aug 2022 | 16 Feb 2024 | British | 48 years |
| Michael Anthony Holliday-williams | Director | 25 May 2007 | 20 Jan 2011 | British | 56 years |
| Michael George Punter | Director | N/A | 29 Jul 1994 | British | 75 years |
| Michael John Edwards | Director | N/A | 31 Mar 1996 | British | 91 years |
| Michael Paul Tildesley | Director | 1 May 2001 | 12 Sept 2005 | British | 72 years |
| Nabila Leather | Director | 11 May 2016 | 31 Jul 2020 | Australian | 48 years |
| Neville Howe | Director | 18 Dec 2015 | 16 May 2016 | British | 66 years |
| Nick Criticos | Director | 1 May 2001 | 1 Jul 2002 | British | 68 years |
| Non-destructive Testers Limited | Corporate Director | 18 Jun 2010 | 18 Dec 2015 | United Kingdom | - |
| Paul Lewis Miles | Director | 12 Sept 2005 | 30 Jun 2010 | British | 55 years |
| Peter Tillotson | Director | N/A | 21 Jan 2000 | British | 75 years |
| Richard Anthony Eves | Secretary | 26 Jun 1997 | 31 Jul 1998 | British | - |
| Richard Douglas Spence Hill | Director | N/A | 22 Jul 1994 | British | 74 years |
| Robert Benjamin Flynn | Director | 4 Aug 2016 | 31 Jul 2020 | British | 50 years |
| Roger Alfred William Farley | Director | 28 Apr 1995 | 31 Dec 1997 | British | 81 years |
| Shriyesh Patel | Director | 1 May 2001 | 3 Feb 2003 | British | 65 years |
| Simon Edward Logan | Director | 18 Dec 2015 | 17 May 2016 | British | 60 years |
| Stephen William Broughton | Director | 21 Jan 2000 | 19 May 2000 | British | 79 years |
| Sydney Dennis Pennington | Director | 10 Oct 1994 | 21 Jan 2000 | British | 81 years |
| Timothy David Payne | Director | 23 Jul 2020 | 20 Sept 2021 | British | 48 years |
| Vanessa Jones | Secretary | 1 May 2001 | 26 Apr 2002 | British | - |