| THOMPSON, Ashley George ACTIVE | Secretary | 30 Oct 2023 | | | | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| HETHERINGTON, Paul Robert ACTIVE | Director | 16 May 2022 | | England | October 1966 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| RUDDER, Jennifer Lynn ACTIVE | Director | 24 Jul 2025 | | England | January 1973 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| SHAPIRO, Ian David ACTIVE | Director | 09 Sep 2025 | | England | May 1974 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| WILBRAHAM, Philip George ACTIVE | Director | 01 Apr 2022 | | United Kingdom | July 1960 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| BURDETT, John Rowland Frank, Doctor RESIGNED | Secretary | 21 Dec 2000 | 10 Jun 2006 | | | 2a Pipers Avenue, Harpenden, Hertfordshire, AL5 1HB |
| CONROY, Paul RESIGNED | Secretary | 24 Jan 2022 | 30 Oct 2023 | | | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| HERBERT, Andrew Charles RESIGNED | Secretary | 06 Apr 2020 | 26 Jan 2022 | | | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| HORAN, James Francis RESIGNED | Secretary | 10 Jun 2006 | 30 Sep 2008 | | | 1 Westmoreland Place, Ealing, London, W5 1QE |
| HORAN, James Francis RESIGNED | Secretary | 31 Mar 2000 | 22 Jan 2001 | | | 1 Westmoreland Place, Ealing, London, W5 1QE |
| LEATHERS, John Walter RESIGNED | Secretary | 25 Jun 1992 | 08 Apr 1996 | | | 31 Long Grove, Harold Wood, Romford, Essex, RM3 0WN |
| LUPTON, David Lloyd RESIGNED | Secretary | 08 Apr 1996 | 31 Mar 2000 | | | 13 Beech Hill Road, Sunningdale, Ascot, Berkshire, SL5 0BN |
| TANNER, Anthony Richard RESIGNED | Secretary | 12 Dec 2018 | 06 Apr 2020 | | | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| TKB REGISTRARS LIMITED RESIGNED | Nominee Secretary | 06 Apr 1992 | 25 Jun 1992 | | | 50 Stratton Street, London, W1X 6NX |
| ATKINSON, Carol Jane RESIGNED | Director | 01 Apr 2008 | 30 Sep 2012 | England | April 1959 | 26 Betjeman Way, Hemel Hempstead, Hertfordshire, HP1 3HH |
| BONFIELD, Peter William, Dr RESIGNED | Director | 01 Apr 2008 | 20 Apr 2018 | England | June 1963 | Building Research Establishment Limited, Bucknalls Lane, Watford, WD25 9XX, England |
| BRAINCH, Jatinder Kaur RESIGNED | Director | 15 Jun 2016 | 31 Jan 2018 | England | March 1974 | Building Research Establishment Limited, Bucknalls Lane, Watford, WD25 9XX, England |
| CHARLESWORTH, Gillian Mary RESIGNED | Director | 21 May 2019 | 09 Sep 2025 | England | December 1961 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| EARNSHAW, Christopher Martin RESIGNED | Director | 01 Apr 2010 | 26 Nov 2019 | England | May 1954 | Building Research Establishment Ltd, Bucknalls Lane, Watford, WD25 9XX, England |
| FAIRLEY, Donald Grant RESIGNED | Director | 21 Dec 2000 | 01 Apr 2003 | | July 1942 | Cannon Cottage Crown Lane, Old Basing, Basingstoke, Hampshire, RG24 7DN |
| FARRIMOND, Nicholas Brian RESIGNED | Director | 01 Apr 2018 | 31 Jul 2019 | England | August 1965 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| FIELD, Philip John RESIGNED | Director | 01 Jan 2000 | 31 Mar 2000 | | April 1944 | 109 Flitwick Road, Ampthill, Bedford, MK45 2NT |
| FRY, Martin Reginald, Professor RESIGNED | Director | 21 Dec 2000 | 11 Jul 2002 | United Kingdom | January 1945 | Bag End The High Street, Hurley, Maidenhead, Berkshire, SL6 5NB |
| HAMMESLEY, Guy Philip RESIGNED | Director | 27 Feb 2007 | 01 Jan 2016 | United Kingdom | September 1950 | 6 Holts Meadow, Redbourn, Hertfordshire, AL3 7BW |
| HERBERT, Andrew Charles RESIGNED | Director | 09 Aug 2019 | 17 Jan 2023 | England | October 1962 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| HEUSCH, Russell RESIGNED | Director | 30 Sep 2008 | 04 Jul 2016 | United Kingdom | June 1960 | 58, Tenby Avenue, Harrow, Middlesex, HA3 8RX |
| HILL, John Lawrence RESIGNED | Director | 25 Jun 1992 | 31 Dec 1996 | | July 1934 | Warwick Lodge, 10 Warwicks Bench, Guildford, Surrey, GU1 3TG |
| HORAN, James Francis RESIGNED | Director | 11 Jul 2002 | 30 Sep 2008 | United Kingdom | July 1952 | 1 Westmoreland Place, Ealing, London, W5 1QE |
| HORAN, James Francis RESIGNED | Director | 31 Mar 2000 | 22 Jan 2001 | United Kingdom | July 1952 | 1 Westmoreland Place, Ealing, London, W5 1QE |
| LUPTON, David Lloyd RESIGNED | Director | 01 Jan 2000 | 31 Mar 2000 | | December 1944 | 13 Beech Hill Road, Sunningdale, Ascot, Berkshire, SL5 0BN |
| MACKENZIE, Kim RESIGNED | Director | 21 Dec 2000 | 11 Jul 2002 | | April 1940 | Spinneymead, Lynx Hill, East Horsley, Surrey, KT24 5AX |
| MELLITT, Brian RESIGNED | Director | 27 Feb 2007 | 20 Apr 2010 | United Kingdom | May 1940 | The Priory 36 Church Street, Stilton, Peterborough, Cambridgeshire, PE7 3RF |
| MESSEM, Darran Keith RESIGNED | Director | 08 Jul 2019 | 06 Apr 2022 | England | June 1966 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| ORME, Graham RESIGNED | Director | 01 Jan 1997 | 31 Dec 1999 | | July 1950 | 5 Shootersway Park, Berkhamsted, Hertfordshire, HP4 3NX |
| ROPER, Mervyn Edward Patrick RESIGNED | Nominee Director | 06 Apr 1992 | 25 Jun 1992 | | October 1954 | 19 Criffel Avenue, London, SW2 4AY |
| SIVAPUNNIYAN, Malathy RESIGNED | Director | 05 Oct 2020 | 15 Jul 2022 | England | January 1981 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| SUTCLIFFE, Brigid Ann RESIGNED | Director | 11 Jul 2016 | 09 Jan 2021 | England | July 1959 | Bre Group Limited, Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| SZYMANSKI, David John RESIGNED | Director | 01 May 2010 | 31 Jul 2015 | England | November 1954 | Rossendale, Top Lane, Mells, Frome, Somerset, BA11 3QN |
| TRAFFORD, Niall Gerard RESIGNED | Director | 25 Jun 2013 | 30 May 2019 | England | March 1962 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| WALL, Catherine Alison RESIGNED | Director | 22 Apr 2014 | 04 Jul 2016 | England | October 1960 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| WHEATON, Ashley Paul RESIGNED | Director | 11 Jul 2016 | 31 Dec 2021 | England | March 1968 | Bre Group Limited, Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| WHITE, Piers Adam RESIGNED | Director | 01 Nov 2019 | 31 Mar 2022 | England | March 1962 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| WIJERATNE, Vinodha Soysa RESIGNED | Director | 15 Dec 2022 | 07 Nov 2024 | Wales | October 1965 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX |
| WYATT, Martin John, Dr RESIGNED | Director | 10 Apr 2006 | 01 Jan 2014 | England | March 1950 | The Birches, School Lane, Essendon, Hertfordshire, AL9 6HD |
| WYATT, Martin John RESIGNED | Director | 31 Mar 2000 | 22 Jan 2001 | | March 1950 | 59 Burnham Green Road, Tewin Wood, Welwyn, Hertfordshire, AL6 0NH |