| BARRY, Richard Paul ACTIVE | Director | 16 Apr 2026 | | England | December 1972 | Rourke House, Watermans Business Park, Staines-Upon-Thames, TW18 3BA, England |
| COLDMAN, Daniel Graham ACTIVE | Director | 01 Apr 2025 | | England | January 1983 | Rourke House, Watermans Business Park, Staines-Upon-Thames, TW18 3BA, England |
| DAY, Sally Micheala ACTIVE | Director | 14 May 2018 | | England | August 1971 | Rourke House, Watermans Business Park, Staines-Upon-Thames, TW18 3BA, England |
| HORNBUCKLE, Steven Colin RESIGNED | Secretary | 15 Nov 2000 | 22 Oct 2003 | | | Flat 13 Arthurs Close, Emersons Green, Bristol, BS16 7JB |
| MOORE, Abigail RESIGNED | Secretary | 24 Jul 2019 | 21 Jul 2022 | | | 1st Floor, Ash House, Littleton Road, Ashford, Middlesex, TW15 1TZ |
| PARSONS, Graham John RESIGNED | Secretary | | 25 Sep 1992 | | | Derwent Ridge, Bullhurst Lane Weston Underwood, Ashbourne, Derbyshire, DE6 4PA |
| QUINLAN, Diane RESIGNED | Secretary | 22 Oct 2003 | 16 Feb 2004 | | | 11 Derwent Yard, Derwent Road Ealing, London, W5 4TW |
| SADLER, Robert William RESIGNED | Secretary | 01 Dec 2005 | 28 Jul 2016 | | | Mathisen Way, Colnbrook, Slough, Berkshire, SL3 0HB |
| SLOSS, Robert RESIGNED | Secretary | 28 Jul 2016 | 24 Jul 2019 | | | Littleton Road, Ashford, Middlesex, TW15 1TZ, England |
| STRATTON, Malcolm RESIGNED | Secretary | 25 Sep 1992 | 15 Nov 2000 | | | White Rose Grange Hollington Road, Stubwood, Uttoxeter, Staffordshire, ST14 5HY |
| WILCOCK, Laura RESIGNED | Secretary | 28 Jul 2016 | 24 Jul 2019 | | | United Technologies House, Shadsworth Road, Blackburn, BB1 2PR, England |
| WILLIAMSON, Paul RESIGNED | Secretary | 16 Feb 2004 | 01 Dec 2005 | | | 39 Avondale Road, Ashford, Middlesex, TW15 3HP |
| COLWILL, Ross Spencer RESIGNED | Director | | 31 Aug 1995 | | April 1933 | 6574 Harbor Beach, Prior Lane, Minnesota Mn 55372, FOREIGN, Usa |
| DEMARLE, Richard H RESIGNED | Director | 01 Jan 2001 | 28 Feb 2006 | | July 1951 | 40 Briant Drive, Sudbury, Ma 01776, United States |
| HARPER, John Michael RESIGNED | Director | | 08 Dec 1999 | United Kingdom | January 1945 | Barley End Stocks Road, Aldbury, Tring, Hertfordshire, HP23 5RZ |
| HORNBUCKLE, Steven Colin RESIGNED | Director | 15 Nov 2000 | 02 Jul 2001 | | July 1967 | 17 Trembear Road, St Austell, Cornwall, PL25 5NY |
| JASTER, Eugene RESIGNED | Director | | 01 May 1997 | | October 1930 | 11224 Stanley Avenue, Bloomington, Minnesota, Usa |
| KEYZOR, Stephen John RESIGNED | Director | 05 Apr 2010 | 17 Dec 2013 | United Kingdom | September 1952 | Mathisen Way, Colnbrook, Slough, Berkshire, SL3 0HB |
| MANNING, Bernadette RESIGNED | Director | 01 Jan 2001 | 31 Jan 2005 | | July 1954 | 2 Baskerville Gardens, Dog Lane, London, NW10 1PF |
| NICHOLAS, John Edward RESIGNED | Director | 08 Dec 1999 | 15 Nov 2000 | England | August 1956 | Amberleigh, Halifax Road, Heronsgate, Rickmansworth, Hertfordshire, WD3 5DF |
| QUINLAW, Diane RESIGNED | Director | 15 Nov 2000 | 02 Jul 2001 | | June 1965 | 54 Darwin Road, Ealing, London, W5 4BD |
| RIDDLE, David Keith RESIGNED | Director | 17 Dec 2013 | 13 Mar 2025 | England | November 1969 | Detector Electronics (U.K.) Limited, Rourke House, Office G11, Watermans Business Park, The Causeway, Staines, TW18 3BA, England |
| WANG, Lu RESIGNED | Director | 01 Jul 2024 | 08 Sep 2025 | United States | January 1977 | Detector Electronics (U.K.) Limited, Rourke House, Office G11, Watermans Business Park, The Causeway, Staines, TW18 3BA, England |
| WATKINS, Garth Kevin Patrick RESIGNED | Director | 11 Apr 2005 | 05 Apr 2010 | England | April 1948 | 118 Copse Hill, Wimbledon, London, SW20 0NL |
| WATKINS, Garth Kevin Patrick RESIGNED | Director | 09 Apr 1996 | 01 Jan 2001 | | April 1948 | 12 Milnthorpe Road, London, W4 3DX |
| CHUBB MANAGEMENT SERVICES LIMITED RESIGNED | Director | 09 Jun 2009 | 24 Jul 2019 | | | Chubb House, Staines Road West, Sunbury-On-Thames, Middlesex, TW16 7AR |
| KIDDE CORPORATE SERVICES LIMITED RESIGNED | Director | 02 Jul 2001 | 12 Nov 2007 | | | Mathisen Way, Colnbrook, Slough, Berkshire, SL3 0HB |
| KIDDE NOMINEES LIMITED RESIGNED | Director | 02 Jul 2001 | 09 Jun 2009 | | | Mathisen Way, Colnbrook, Slough, Berkshire, SL3 0HB |
| WESTMINSTER SECURITIES LIMITED RESIGNED | Director | | 15 Nov 2000 | | | Pentagon House, Sir Frank Whittle Road, Derby, DE21 4XA |
| WILLIAMS MANAGEMENT SERVICES LIMITED RESIGNED | Director | | 15 Nov 2000 | | | Pentagon House, Sir Frank Whittle Road, Derby, Derbyshire, DE21 4XA |