| THOMPSON, Ashley George ACTIVE | Secretary | 30 Oct 2023 | | | | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| RUDDER, Jennifer Lynn ACTIVE | Director | 24 Jul 2025 | | England | January 1973 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| SHAPIRO, Ian David ACTIVE | Director | 09 Sep 2025 | | England | May 1974 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| CONROY, Paul, Dr RESIGNED | Secretary | 20 Jul 2022 | 30 Oct 2023 | | | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| PENN, David Alfred RESIGNED | Secretary | 20 Nov 2015 | 26 Feb 2016 | | | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| SEGER, Roy Henry William RESIGNED | Secretary | 26 Apr 2004 | 20 Nov 2015 | | | 59 Abbots Gardens, London, N2 0JG |
| BRISTOWS SECRETARIAL LIMITED RESIGNED | Secretary | 22 Oct 2002 | 26 Apr 2004 | | | 3 Lincoln's Inn Fields, London, WC2A 3AA |
| SWIFT INCORPORATIONS LIMITED RESIGNED | Nominee Secretary | 22 Oct 2002 | 22 Oct 2002 | | | 26, Church Street, London, NW8 8EP |
| BENNETT, John Nicholas, Dr RESIGNED | Director | 11 Dec 2002 | 26 Apr 2004 | United Kingdom | April 1949 | Roseneath, Peat Common, Elstead, GU8 6DX |
| BLIGH, David Jonathan RESIGNED | Director | 11 Feb 2005 | 12 Mar 2008 | England | June 1953 | 37 Church Street, Appleby Magna, Swadlincote, Derbyshire, DE12 7BB |
| BRAINCH, Jatinder Kaur RESIGNED | Director | 01 Oct 2017 | 31 Jan 2018 | England | March 1974 | Building Research Establishment Ltd, Bucknalls Lane, Watford, WD25 9XX, England |
| BROADBENT, Christopher RESIGNED | Director | 20 Nov 2015 | 27 Feb 2019 | England | November 1954 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| BROYD, Timothy William, Professor RESIGNED | Director | 06 Aug 2009 | 20 Nov 2015 | England | November 1954 | 2, Hillbury Gardens, Warlingham, Surrey, CR6 9TQ |
| CAIRNS, Kate RESIGNED | Director | 23 Jun 2006 | 20 Nov 2015 | United Kingdom | February 1972 | East Winds, Newton By The Sea, Alnwick, Northumberland, NE66 3DY |
| CAIRNS, Kate RESIGNED | Director | 26 Apr 2004 | 11 May 2005 | | February 1972 | 18 Mayflower Road, London, Greater London, SW9 9JZ |
| CHARLESWORTH, Gillian Mary RESIGNED | Director | 01 Sep 2020 | 09 Sep 2025 | England | December 1961 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| COACKLEY, Richard James RESIGNED | Director | 30 Sep 2013 | 20 Nov 2015 | England | December 1954 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| DUNN, Gavin Neil, Dr RESIGNED | Director | 20 Nov 2015 | 16 Jan 2018 | England | June 1975 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| EKINS, John Duguid Kethro RESIGNED | Director | 26 Apr 2004 | 23 Jun 2006 | | January 1943 | Elm Cottage, 36 Catisfield Lane, Fareham, Hampshire, PO15 5NP |
| FISHER, Peter Harrison RESIGNED | Director | 11 Feb 2005 | 22 Apr 2014 | United Kingdom | July 1950 | 2 Amberlands, Stretton, Burton On Trent, Staffordshire, DE13 0PE |
| GERRETT, Alan Mark RESIGNED | Director | 11 Mar 2008 | 20 Nov 2015 | United Kingdom | January 1959 | 27, Callerton Court, Ponteland, Newcastle Upon Tyne, Tyne And Wear, NE20 9EN |
| GOUT, Lesley Ann RESIGNED | Director | 26 Apr 2004 | 02 Nov 2004 | | August 1958 | 21 Marshall Drive, Ivybridge, Devon, PL21 0UQ |
| GRICE, Judith RESIGNED | Director | 09 Jun 2004 | 31 Aug 2004 | United Kingdom | February 1952 | The Old Rectory, Cottage House, Olney Road, Emberton, Olney, Buckinghamshire, MK46 5BX |
| HERBERT, Andrew Charles RESIGNED | Director | 14 Nov 2019 | 17 Jan 2023 | England | October 1962 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| HUGHES, Edward Eric RESIGNED | Director | 23 Jun 2006 | 24 Jul 2013 | United Kingdom | November 1945 | Bybridge, Itchen Abbas, Winchester, Hampshire, SO21 1AS |
| JENKINS, William Owen, Dr RESIGNED | Director | 21 Sep 2009 | 20 Nov 2015 | United Kingdom | April 1957 | 147, Hampden Way, London, N14 5AY |
| JOHNSTON, Jacqueline Frances RESIGNED | Director | 10 Nov 2005 | 23 Jun 2006 | United Kingdom | June 1962 | 23 Bentsbrook Park, North Holmwood, Dorking, Surrey, RH5 4JL |
| KING, Edward Geoffrey RESIGNED | Director | 23 Jun 2006 | 21 Jun 2010 | United Kingdom | October 1951 | 29 The Borough, Brockham, Betchworth, Surrey, RH3 7NB |
| KING, Edward Geoffrey RESIGNED | Director | 26 Apr 2004 | 04 Jul 2005 | United Kingdom | October 1951 | 29 The Borough, Brockham, Betchworth, Surrey, RH3 7NB |
| LACE, John David RESIGNED | Director | 22 Oct 2002 | 11 Dec 2002 | | September 1947 | 58 Dukes Avenue, Chiswick, London, W4 2AF |
| MONTAGUE, Keith Norman RESIGNED | Director | 26 Apr 2004 | 21 Sep 2009 | | April 1943 | 11 Westfield Close, Hitchin, Hertfordshire, SG5 2HF |
| NEWTON, John RESIGNED | Director | 26 Apr 2004 | 10 Jun 2015 | England | June 1950 | Flat 8 Hermes House, 59a Josephine Avenue, London, SW2 2JG |
| SMITH, Deborah Anita, Dr RESIGNED | Director | 27 Feb 2019 | 01 Apr 2020 | England | August 1960 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| SOUTHWOOD, Richard Mark Langley RESIGNED | Director | 21 Jun 2011 | 20 Nov 2015 | England | May 1959 | Barnards, Station Road, Horsted Keynes, Haywards Heath, West Sussex, RH17 7ED |
| SWAIN, Andrew RESIGNED | Director | 01 Dec 2008 | 20 Nov 2015 | United Kingdom | August 1972 | 31, Woodland View, Southwell, Nottinghamshire, NG25 0AG |
| WIJERATNE, Vinodha Soysa RESIGNED | Director | 16 Dec 2022 | 07 Nov 2024 | Wales | October 1965 | Bucknalls Lane, Garston, Watford, Hertfordshire, WD25 9XX, England |
| INSTANT COMPANIES LIMITED RESIGNED | Nominee Director | 22 Oct 2002 | 22 Oct 2002 | | | 1, Mitchell Lane, Bristol, Avon, BS1 6BU |