| JORDAN, Nicola Diane ACTIVE | Secretary | 01 Jun 2018 | | | | Sixth Floor, The Lantern, 75 Hampstead Road, London, NW1 2PL, England |
| FEULNER, Marko Egon ACTIVE | Director | 01 Jan 2025 | | Germany | August 1974 | Sixth Floor, The Lantern, 75 Hampstead Road, London, NW1 2PL, England |
| MORRIS, Robert John ACTIVE | Director | 01 Jan 2025 | | England | July 1961 | Sixth Floor, The Lantern, 75 Hampstead Road, London, NW1 2PL, England |
| CARLESS, Helen Claire RESIGNED | Secretary | 03 May 2013 | 01 Aug 2016 | | | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD, United Kingdom |
| DAVINA, Simone Eufemia Agatha RESIGNED | Secretary | 02 Aug 2016 | 01 Jun 2018 | | | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD |
| FRANKLIN, Norman James RESIGNED | Secretary | | 31 Oct 1993 | | | 26 Glen Court, Benfleet, Essex, SS7 1TT |
| INVENSYS SECRETARIES LIMITED RESIGNED | Secretary | 31 Oct 1993 | 02 May 2013 | | | 40, Grosvenor Place, London, SW1X 7AW |
| BARRY, Stephen John RESIGNED | Director | 05 Jan 2010 | 06 May 2014 | United Kingdom | April 1964 | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD, United Kingdom |
| BAYS, James Claude RESIGNED | Director | 02 Jul 1999 | 30 Mar 2001 | | July 1949 | 28 Elmstone Road, Fulham, London, SW6 5TN |
| BROWN, Robert Casson RESIGNED | Director | 02 Nov 1993 | 31 Dec 1997 | | March 1939 | 38 Newlands Avenue, Melton Park, Newcastle Upon Tyne, NE3 5PX |
| BRYAN, Andrew RESIGNED | Director | 04 Oct 2006 | 20 May 2013 | United Kingdom | November 1963 | 3rd, Floor 40, Grosvenor Place, London, SW1X 7AW |
| CAMPION, Geoffrey Charles John RESIGNED | Director | | 06 Oct 2003 | | February 1959 | 3 Eastcourt, Burbage, Marlborough, Wiltshire, SN8 3AG |
| CLARK, John Ernle RESIGNED | Director | 15 Apr 1998 | 31 Mar 2006 | | October 1948 | 15 Grove Avenue, Yeovil, Somerset, BA20 2BB |
| CLAYTON, John Reginald William RESIGNED | Director | 09 Feb 2001 | 31 Dec 2005 | England | December 1950 | Matley House, Grange Lane, Little Dunmow, Great Dunmow, Essex, CM6 3HY |
| COPELAND, Paul Jeffrey RESIGNED | Director | 09 Apr 2014 | 13 Feb 2018 | England | April 1956 | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD, United Kingdom |
| COTTON, John Anthony RESIGNED | Director | 04 Aug 1998 | 29 Sep 2006 | | April 1947 | Monkton House Perrymead, Bath, BA2 5AX |
| CROSS, Peter John RESIGNED | Director | | 08 Nov 2002 | | June 1948 | The Birches, 32 Belcombe Road, Bradford On Avon, Wiltshire, BA15 1LZ |
| CROSSFIELD, Nicholas RESIGNED | Director | 07 Jun 2010 | 29 Nov 2013 | United Kingdom | March 1965 | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD, United Kingdom |
| CROWTHER, Brian Edward RESIGNED | Director | 22 Oct 1992 | 12 Jul 2003 | | November 1948 | Moat Springs Barn Gorsty Hill, Marchington Woodlands, Uttoxeter, Staffordshire, ST14 8PQ |
| FULLELOVE, Glyn William RESIGNED | Director | 13 Jan 2006 | 30 Mar 2007 | United Kingdom | April 1961 | Brook House, Spout Lane Tansley, Matlock, Derbyshire, DE4 5FH |
| GORE, Michael Ian RESIGNED | Director | 08 Jan 2007 | 31 Mar 2010 | United Kingdom | January 1965 | 17 Elizabeth Gardens, Sunbury On Thames, Middlesex, TW16 5LG |
| GRANT, Howard Robert RESIGNED | Director | | 30 Sep 1992 | | November 1940 | Elmsleigh Market Place, Colerne, Chippenham, Wiltshire, SN14 8DF |
| HALL, Andrew Douglas RESIGNED | Director | 03 May 2013 | 31 Mar 2014 | England | July 1963 | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD, United Kingdom |
| HARDING, Christopher Michael Wesley RESIGNED | Director | | 29 Sep 2006 | | March 1948 | The Haven, London Road Pewsham, Chippenham, Wiltshire, SN15 3RW |
| HOWKER, Anthony RESIGNED | Director | | 30 Jun 1992 | | March 1940 | Fairways, Sandhills Lane, Virginia Water, Surrey, GU25 4BW |
| HULL, Victoria Mary RESIGNED | Director | 11 Feb 2003 | 30 Jan 2013 | United Kingdom | March 1962 | 3rd Floor, 40, Grosvenor Place, London, SW1X 7AW |
| JORDAN, Nicola Diane RESIGNED | Director | 09 Feb 2023 | 01 Jan 2025 | England | May 1969 | Sixth Floor, The Lantern, 75 Hampstead Road, London, NW1 2PL, England |
| JORDAN, Nicola Diane RESIGNED | Director | 30 May 2019 | 25 Oct 2019 | United Kingdom | May 1969 | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD, United Kingdom |
| MCPHEE, Alistair Dickson RESIGNED | Director | 04 Oct 2006 | 16 Dec 2009 | Scotland | July 1958 | 63 Balmoral Drive, Bishopton, Renfrewshire, PA7 5HR |
| MILLS, John David RESIGNED | Director | | 01 May 1998 | United Kingdom | August 1947 | Henthorn, Upper Seagry, Chippenham, Wiltshire, SN15 5EZ |
| O'DONOVAN, Kathleen Anne RESIGNED | Director | | 31 Dec 2002 | United Kingdom | May 1957 | 3c Cintra Park, Upper Norwood, London, SE19 2LH |
| OWEN, Sandra Julie RESIGNED | Director | 15 Dec 2017 | 31 Dec 2024 | England | January 1960 | Sixth Floor, The Lantern, 75 Hampstead Road, London, NW1 2PL, England |
| PICKERING, David RESIGNED | Director | | 31 Dec 1998 | | October 1937 | 26 Hardenhuish Avenue, Chippenham, Wiltshire, SN15 1NW |
| SPENCER, Rachel Louise RESIGNED | Director | 30 Mar 2001 | 11 Feb 2003 | United Kingdom | February 1966 | The Cottage, Amy Lane, Chesham, Buckinghamshire, HP5 1NB |
| STEVENS, David John RESIGNED | Director | 31 Dec 1997 | 14 May 1999 | | March 1950 | 42 Burghley Road, Wimbledon, London, SW19 5HN |
| THOM, James Demmink RESIGNED | Director | 23 May 1994 | 09 Feb 2001 | | July 1946 | Tollgate Cottage, Turners Hill Road, Crawley Down, West Sussex, RH10 4HG |
| THOMAS, David Jeremy RESIGNED | Director | 13 Jan 2006 | 30 Jan 2013 | United Kingdom | May 1954 | 3rd Floor, 40, Grosvenor Place, London, SW1X 7AW |
| THRELFALL, Philip RESIGNED | Director | 26 May 2011 | 07 May 2014 | England | October 1958 | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD, United Kingdom |
| WAKEFORD, Gordon Lawrence RESIGNED | Director | 15 Dec 2017 | 30 May 2019 | England | June 1962 | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD |
| WHITFIELD, Eleanor Katherine RESIGNED | Director | 04 Oct 2006 | 15 Dec 2009 | England | October 1964 | The Old House, Beckspool Road Frenchay, Bristol, Avon, BS16 1ND |
| WILD, Mark RESIGNED | Director | 15 Dec 2009 | 18 Jun 2010 | United Kingdom | May 1965 | Portland House, Bressenden Place, London, SW1E 5BF |
| WILLIAMS, Stanley Killa RESIGNED | Director | | 02 Nov 1993 | England | July 1945 | White Raven, Park Lane, Ashtead, Surrey, KT21 1EU |
| WILSON, William Henry Richard RESIGNED | Director | 26 Jun 2019 | 25 Jan 2023 | England | October 1967 | Sixth Floor, The Lantern, 75 Hampstead Road, London, NW1 2PL, England |
| YILMAZ, Olcay RESIGNED | Director | 03 May 2013 | 31 May 2018 | United Kingdom | February 1973 | Faraday House, Sir William Siemens Square, Frimley, Camberley, Surrey, GU16 8QD, United Kingdom |