| JEMMOTT-JAMES, Vanessa ACTIVE | Secretary | 28 May 2026 | | | | C/O Workman Llp, 7th Floor, 3 Newbridge Sq., Swindon, SN1 1BY, United Kingdom |
| BROWN, Holly Constance Kathleen ACTIVE | Director | 26 Jan 2026 | | United Kingdom | March 1994 | 50, Grosvenor Hill, London, W1K 3QT, United Kingdom |
| COAKLEY, Erika ACTIVE | Director | 26 Jan 2026 | | United Kingdom | May 1992 | C/O Workman Llp, 7th Floor, 3 Newbridge Sq., Swindon, SN1 1BY, United Kingdom |
| DAVIS, Robert ACTIVE | Director | 30 Nov 2019 | | England | January 1969 | C/O Workman Llp, Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| MAHER, Karen Louise ACTIVE | Director | 12 Jan 2022 | | United Kingdom | May 1980 | C/O Advanced Research Clusters, Harwell Quad Two, Rutherford Avenue, Harwell, OX11 0DF, United Kingdom |
| SMITH, Mark Geoffrey ACTIVE | Director | 30 Nov 2019 | | England | December 1971 | C/O Workman Llp, 7th Floor, 3 Newbridge Sq., Swindon, SN1 1BY, United Kingdom |
| STRETTON, James Peter ACTIVE | Director | 12 Jan 2022 | | United Kingdom | September 1981 | C/O Advanced Research Clusters, Harwell Quad Two, Rutherford Avenue, Harwell, OX11 0DF, United Kingdom |
| BIRDWOOD, Gordon Thomas RESIGNED | Secretary | 01 Jul 2013 | 15 Jan 2017 | | | Alliance House, 12 Caxton Street, London, SW1H 0QS, England |
| DUFFIELD, David Mark Johnston RESIGNED | Secretary | 25 Jun 1999 | 23 Jul 2001 | | | 58 West Chiltern, Woodcote, Reading, Berkshire, RG8 0SG |
| EVANS, David Malcolm RESIGNED | Secretary | | 12 Jan 1993 | | | Stratton House, Stratton Street, London, W1J 8LA |
| FERGUSON, Iain Donald RESIGNED | Secretary | 28 Feb 1994 | 25 Sep 1996 | | | 2 Chalet Close, Shootersway Lane, Berkhamsted, Hertfordshire, HP4 3NR |
| LYNE, Sarah Jane RESIGNED | Secretary | 25 Sep 1996 | 25 Jun 1999 | | | 11 Abelia Close, West End, Woking, Surrey, GU24 9PG |
| READ, Jonathan David RESIGNED | Secretary | 23 Jul 2001 | 25 Jun 2007 | | | 179 Tanworth Lane, Shirley, Solihull, West Midlands, B90 4BZ |
| SWAIN, John Kenneth RESIGNED | Secretary | 12 Jan 1993 | 28 Feb 1994 | | | 77 Grosvenor Street, London, W1A 2BT |
| WELLMAN, Alison RESIGNED | Secretary | 22 Jan 2015 | 28 May 2026 | | | C/O Workman Llp, 7th Floor, 3 Newbridge Sq., Swindon, SN1 1BY, United Kingdom |
| ANCOSEC LIMITED RESIGNED | Secretary | 25 Jun 2007 | 01 Jul 2013 | | | Arlington House, Arlington Business Park Theale, Reading, Berkshire, RG7 4SA |
| ALLEN, Godfrey Alwin RESIGNED | Director | 02 Nov 1994 | 25 Jun 1996 | | April 1936 | 45 Burnt Oak, Cookham, Berkshire, SL6 9RN |
| AUSTEN, Jonathan Martin RESIGNED | Director | 30 Sep 2006 | 28 May 2008 | United Kingdom | June 1956 | Lygon Croft, Sandy Way, Cobham, Surrey, KT11 2EY |
| BARROWCLOUGH, David Francis RESIGNED | Director | 23 Nov 2007 | 25 Sep 2014 | United Kingdom | January 1957 | 45 Keable Road, Marks Tey, Colchester, Essex, CO6 1XB |
| BATES, Julian Francis RESIGNED | Director | 03 Sep 2013 | 22 Jan 2015 | United Kingdom | July 1963 | Alliance House, 12 Caxton Street, London, SW1H 0QS, England |
| BENNETT, Charles Anthony Howson RESIGNED | Director | 23 Dec 2004 | 27 Apr 2005 | | October 1954 | 30 Amberley Road, Buckhurst Hill, Essex, IG9 5QW |
| BLANGY, Jean-Philippe Jean-Jacques RESIGNED | Director | 05 May 2021 | 15 Dec 2021 | United Kingdom | July 1975 | Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| BULLOCK, Jeremy Nicholas RESIGNED | Director | 18 Oct 2016 | 28 Apr 2021 | England | May 1968 | Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| CANN, Jane Denise RESIGNED | Director | 14 Mar 1994 | 14 Sep 1998 | | July 1959 | 87 Surbiton Court, St Andrews Square, Surbiton, Surrey, KT6 4EE |
| CHAPMAN, Piers Christopher RESIGNED | Director | 01 Jul 2013 | 30 Nov 2019 | United Kingdom | May 1971 | Alliance House, 12 Caxton Street, London, SW1H 0QS, England |
| CHATER, Beth Salena RESIGNED | Director | 14 Sep 1998 | 31 Oct 2008 | United Kingdom | May 1961 | Langham Lodge, Bucklebury Alley, Newbury, Berkshire, RG18 9NH |
| CORNELL, James Martin RESIGNED | Director | 31 Dec 2009 | 01 Jul 2013 | England | January 1974 | Arlington House, Arlington House, Arlington Business Park, Theale, Reading, Berkshire, RG7 4SA, England |
| CUNLIFFE, Matthew Christopher Myles RESIGNED | Director | 27 Apr 2005 | 23 Nov 2007 | United Kingdom | October 1968 | 109 Clapham Common Northside, London, SW4 9SH |
| DAVIS, Robert RESIGNED | Director | 31 Mar 2019 | 30 Nov 2019 | England | January 1969 | C/O Workman Llp, Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| DEEKS, Matthew Robert RESIGNED | Director | 16 Sep 2014 | 24 Nov 2015 | United Kingdom | February 1969 | C/O Cbre Limited, St Martin's Court, 10 Paternoster Row, London, England, EC4M 7HP, England |
| DEIGMAN, Patrick RESIGNED | Director | 28 Feb 1994 | 30 Sep 2006 | United Kingdom | February 1952 | Frith Hill House, Frith Hill, Great Missenden, Buckinghamshire, HP16 0QR |
| DUFFIELD, David Mark Johnston RESIGNED | Director | 14 Sep 1998 | 14 Sep 2007 | England | March 1949 | 58 West Chiltern, Woodcote, Reading, Berkshire, RG8 0SG |
| EVANS, Howard RESIGNED | Director | 16 Sep 2014 | 30 Nov 2019 | England | July 1966 | Alliance House, 12 Caxton Street, London, SW1H 0QS, United Kingdom |
| FERGUSON, Iain Donald RESIGNED | Director | 28 Feb 1994 | 25 Sep 1996 | United Kingdom | April 1955 | 2 Chalet Close, Shootersway Lane, Berkhamsted, Hertfordshire, HP4 3NR |
| FLETCHER, David Jonathan Richard RESIGNED | Director | | 12 Jan 1993 | United Kingdom | November 1942 | Stratton House, Stratton Street, London, W1X 5FE |
| FLYNN, James Joseph RESIGNED | Director | 22 Jan 2015 | 31 Mar 2019 | United Kingdom | May 1957 | 80, Cheapside, London, EC2V 6DZ, United Kingdom |
| FOSTER, Paul Brett RESIGNED | Director | 07 May 2019 | 07 Feb 2023 | Guernsey | March 1957 | Craigard Property Trading Ltd, 1650 Parkway, Solent Business Park, Whiteley, Fareham, Hampshire, PO15 7AH, United Kingdom |
| HILL, Martin Robert Vincent RESIGNED | Director | 25 Jun 1996 | 14 Sep 1998 | | March 1963 | 158 Trevelyan Road, London, SW17 9LW |
| IBBETSON, Wendy RESIGNED | Director | 04 May 2004 | 03 Sep 2004 | | August 1960 | 148 Rochester Drive, Bexley, Kent, DA5 1QG |
| JOHNSTON, Andrew James RESIGNED | Director | 31 Oct 2008 | 01 Jul 2013 | United Kingdom | October 1958 | Langford Grange, Langford, Nr Lechlade, Gloucestershire, GL7 3LF |
| JONES, Colin Dennis RESIGNED | Director | 04 May 2004 | 23 Nov 2007 | | October 1953 | 61 Monkhams Lane, Woodford Green, Essex, IG8 0NN |
| JONES, Nicholas Andrew De Burgh RESIGNED | Director | 22 Jan 2015 | 19 May 2016 | United Kingdom | January 1981 | 80, Cheapside, London, England, EC2V 6EE, England |
| LYALL, Stephen Charles RESIGNED | Director | 12 Jan 1993 | 28 Feb 1994 | | May 1948 | 77 Grosvenor Street, London, W1A 2BT |
| MARSHALL, Michael James Ettrick RESIGNED | Director | 12 Jan 1993 | 28 Feb 1994 | United Kingdom | April 1947 | 14 Palmerston House, London, W8 7PU |
| MCINNES, Alasdair Charles Edward RESIGNED | Director | 12 Jan 2022 | 31 Dec 2025 | England | September 1983 | Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| MOHANLAL, Satish RESIGNED | Director | 31 Oct 2008 | 30 Sep 2009 | | April 1964 | 21 Mostyn Gardens, London, NW10 5QU |
| MOORE, Nicholas James RESIGNED | Director | 01 Jul 2007 | 31 Jan 2010 | | January 1976 | 250 Rainsford Road, Chelmsford, Essex, CM1 2PN |
| MURRAY, Nicholas Stuart Granville RESIGNED | Director | 25 Jun 1996 | 14 Sep 1998 | United Kingdom | June 1962 | Oak House, 51 Oxshott Way, Cobham, Surrey, KT11 2RU |
| NEILSON, Emily Jane, Miss. RESIGNED | Director | 17 Jun 2010 | 19 Feb 2015 | England | July 1975 | Arlington House, Arlington Business Park, Theale, Reading, RG7 4SA |
| NEWTON, Simon John RESIGNED | Director | 01 Jul 2013 | 30 Nov 2019 | United Kingdom | May 1958 | Alliance, House, 12 Caxton Street, London, SW1H 0QS, England |
| O'SULLIVAN, Michael James RESIGNED | Director | 31 Oct 2008 | 31 Dec 2009 | | October 1966 | Greenlawns, 21 Broad Highway, Cobham, Surrey, KT11 2RR |
| PILGRIM, Simon Richard Ellis RESIGNED | Director | | 12 Jan 1993 | | December 1947 | Maytrees 27 Portmore Park Road, Weybridge, Surrey, KT13 8ET |
| POPE, Nigel Howard RESIGNED | Director | 31 Oct 2008 | 31 Dec 2009 | England | July 1964 | 17, Hawthorne Road, Bromley, Kent, BR1 2HN |
| POTTER, Richard James RESIGNED | Director | 31 Jul 2017 | 31 Jul 2017 | United Kingdom | January 1966 | Building 1025, Arlington House, Arlington Business Park, Theale, Reading, Berkshire, RG7 4SA, United Kingdom |
| POTTER, Richard James RESIGNED | Director | 31 Dec 2009 | 27 Dec 2021 | United Kingdom | January 1966 | Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| PULSFORD, Jeffrey Mark RESIGNED | Director | 14 Sep 1998 | 30 Jun 2008 | United Kingdom | August 1959 | Denesfield, 16 Lytton Park, Cobham, Surrey, KT11 2HB |
| RAVEN, James William Matthew, Mr RESIGNED | Director | 19 Sep 2017 | 09 Sep 2021 | United Kingdom | June 1972 | Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| REED, Robert Paul RESIGNED | Director | 05 Mar 2015 | 29 Aug 2017 | United Kingdom | September 1968 | Nelson House, Central Boulevard, Blythe Valley Park, Solihull, West Midlands, B90 8BG, United Kingdom |
| REED, Robert Paul RESIGNED | Director | 23 May 2011 | 19 Feb 2015 | United Kingdom | September 1968 | Nelson, House, Central Boulevard Shirley, Solihull, West Midlands, B90 8BG, England |
| SADLER, Nicholas James RESIGNED | Director | 23 Feb 1994 | 28 Feb 1994 | | December 1943 | Clivia Windmill Hill, Coleshill, Amersham, Buckinghamshire, HP7 0LZ |
| SINGLA, Padmini RESIGNED | Director | 12 Jan 2022 | 31 Dec 2025 | United Kingdom | April 1981 | Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| SMITH, Mark Geoffrey RESIGNED | Director | 19 May 2016 | 30 Nov 2019 | England | December 1971 | Minton Place, Station Road, Swindon, SN1 1DA |
| SMITH, Oliver RESIGNED | Director | 28 Feb 1994 | 02 Nov 1994 | | March 1967 | 48 Redcliffe Gardens, London, SW10 9HB |
| TERRY, Mark James RESIGNED | Director | 18 Oct 2016 | 15 Dec 2021 | England | January 1977 | Minton Place, Station Road, Swindon, SN1 1DA, United Kingdom |
| TIBBETTS, Michael Andrew RESIGNED | Director | 31 Dec 2009 | 17 Jun 2010 | England | October 1965 | Arlington House, Arlington House, Arlington Business Park, Theale, Reading, Berkshire, RG7 4SA, England |
| WILLIAMS, Richard Jon Philip RESIGNED | Director | 16 Sep 2014 | 18 Oct 2016 | United Kingdom | April 1964 | C/O Cbre St Martins Court, 10 Paternoster Row, London, England, EC4M 7HP, England |
| WORKMAN, David Russell RESIGNED | Director | 03 Sep 2013 | 22 Jan 2015 | England | July 1963 | Alliance House, 12 Caxton Street, London, SW1H 0QS, England |
| YOUNG, Sebastian RESIGNED | Director | 21 Dec 2015 | 28 Jul 2016 | United Kingdom | June 1982 | St Martin's Court, Paternoster Row, London, EC4M 7HP, United Kingdom |