| Alan Arthur | Director | 23 Apr 1992 | 16 May 2001 | British | 82 years |
| Clare Elizabeth Davage | Director | 16 Jun 2011 | 20 Dec 2011 | British | 56 years |
| Denise Patricia Cockrem | Director | 5 Dec 2008 | 16 Jun 2011 | British | 64 years |
| Elinor Sarah Bell | Director | 14 Nov 2014 | 31 Oct 2017 | British | 57 years |
| Eric Roland Wills | Secretary | 23 Apr 1992 | 23 Apr 1997 | British | - |
| Ian Adam Craston | Director | 5 Dec 2008 | 16 Jun 2011 | British | 60 years |
| Ian David Hutchinson | Director | 2 Apr 2004 | 28 Sept 2004 | British | 72 years |
| Jacqueline Elizabeth Fox | Secretary | 3 Jul 2002 | 9 Dec 2005 | British | - |
| Jan Victor Miller | Director | 5 Mar 1998 | 28 Sept 2004 | British | 75 years |
| Jason Leslie Wright | Secretary | 15 Sept 2000 | 20 Oct 2000 | British | - |
| John Hilton Berg | Secretary | 31 Jul 1998 | 15 Sept 2000 | British | - |
| John Michael Mills | Director | 16 Jun 2011 | 14 Nov 2014 | British | 62 years |
| Julian Christopher Hance | Director | 29 Jun 2001 | 2 Apr 2004 | British | 71 years |
| Kathryn Anna Bailey | Director | 16 Jun 2011 | 13 Jun 2012 | British | 48 years |
| Michael Harris | Director | 5 Dec 2008 | 16 Jun 2011 | British | 61 years |
| Non-destructive Testers Limited | Corporate Director | 28 Jun 2012 | 29 Sept 2017 | United Kingdom | - |
| Non-destructive Testers Limited | Corporate Director | 2 Apr 2004 | 16 Dec 2008 | United Kingdom | - |
| Paul Lewis Miles | Director | 5 Dec 2008 | 30 Jun 2010 | British | 55 years |
| Richard Anthony Eves | Secretary | 24 Apr 1997 | 31 Jul 1998 | British | - |
| Robert John Clayton | Director | 5 Dec 2008 | 16 Jun 2011 | British | 56 years |
| Roger Albert Gartside Neville | Director | 23 Apr 1992 | 30 Jun 1994 | British | 95 years |
| Roysun Limited | Corporate Director | 27 Jul 2004 | 16 Dec 2008 | United Kingdom | - |
| Thomas Arthur Hayes | Director | 23 Apr 1992 | 29 Jun 2001 | British | 83 years |
| Thomas Scott Nelson | Director | 23 Apr 1992 | 5 Mar 1998 | British | 87 years |
| Vanessa Jones | Secretary | 20 Oct 2000 | 26 Apr 2002 | British | - |