| JTC (UK) LIMITED ACTIVE | Secretary | 29 Jun 2023 | | | | The Scalpel, 18th Floor, 52 Lime Street, London, EC3M 7AF, United Kingdom |
| BROWN, Tony ACTIVE | Director | 21 Dec 2018 | | United States | April 1963 | 3, Forbury Place, 23 Forbury Road, Reading, RG1 3JH, United Kingdom |
| THORNLEY, Simon Carwyn ACTIVE | Director | 17 Oct 2022 | | United Kingdom | February 1972 | 3, Forbury Place, 23 Forbury Road, Reading, RG1 3JH, United Kingdom |
| TURLAND, Kevin John ACTIVE | Director | 10 Aug 2015 | | United Kingdom | March 1969 | 3, Forbury Place, 23 Forbury Road, Reading, RG1 3JH, United Kingdom |
| FREEMAN, Kenneth Webb RESIGNED | Secretary | 14 May 1999 | 21 May 1999 | | | Apartment 20d 350 East 79th Street, New York 10021, Usa |
| HILL, Catherine RESIGNED | Secretary | 11 Jun 1999 | 01 Feb 2000 | | | 30 Comeragh Road, London, W14 9HR |
| HUNKLER, Jacqueline RESIGNED | Secretary | 18 Jun 2014 | 09 Nov 2016 | | | 500, Brook Drive, Green Park, Reading, Berkshire, RG2 6UU, United Kingdom |
| KELLETT, Andrew John RESIGNED | Secretary | 01 Feb 2000 | 25 Jan 2006 | | | Quest Diagnostics Ltd, Parkway West, Canford Lane, Heston, Middlesex, TW5 9QA |
| SMITH, Linda Ellen RESIGNED | Secretary | 29 Oct 2008 | 18 Jun 2014 | | | Unit 1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| WILSON, Thomas Arthur RESIGNED | Secretary | 25 Jan 2006 | 29 Oct 2008 | | | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| HALCO SECRETARIES LIMITED RESIGNED | Secretary | 21 Aug 2018 | 29 Jun 2023 | | | 5, Fleet Place, London, EC4M 7RD, England |
| SWIFT INCORPORATIONS LIMITED RESIGNED | Nominee Secretary | 14 Apr 1999 | 14 May 1999 | | | 26, Church Street, London, NW8 8EP |
| AHWIEH, Tina Eseroghene RESIGNED | Director | 07 Nov 2014 | 19 Jan 2016 | United Kingdom | November 1963 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| BERRY, Paul Robert, Dr. RESIGNED | Director | 02 Jul 2013 | 24 Oct 2018 | United Kingdom | October 1953 | 500, Brook Drive, Green Park, Reading, Berkshire, RG2 6UU, United Kingdom |
| BRETT, Wade, Dr RESIGNED | Director | 11 Jun 1999 | 01 Mar 2002 | | September 1954 | 16 Mitchell Walk, Amersham, Buckinghamshire, HP6 6NW |
| CALAMARI, Stephen Andrew RESIGNED | Director | 07 Nov 2014 | 08 Jul 2015 | Usa | October 1954 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| CINCO-ABELA, Teresa De Leon RESIGNED | Director | 07 Nov 2014 | 08 Jul 2015 | Usa | January 1970 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| FIKRY, Christopher Charles, Dr RESIGNED | Director | 19 Sep 2012 | 07 Nov 2014 | United States | February 1977 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| FINNEGAN, Kenneth Robert RESIGNED | Director | 30 Sep 2008 | 14 Apr 2011 | | July 1959 | Unit 1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| FREEMAN, Kenneth Webb RESIGNED | Director | 14 May 1999 | 07 Apr 2004 | | June 1950 | Apartment 20d 350 East 79th Street, New York 10021, Usa |
| HAGEMANN, Robert RESIGNED | Director | 07 Apr 2004 | 20 Jun 2008 | | September 1956 | 16 Rochambeau Road, Pompton Plains, Nj 07444, Usa |
| HARVEY, Michael Hugh, Dr RESIGNED | Director | 14 Feb 2008 | 28 Jun 2013 | Great Britain | July 1957 | Unit B1, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| HAWKSWORTH, David George, Dr RESIGNED | Director | 12 Jul 2010 | 25 Sep 2012 | England | May 1953 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| HUNKLER, Jacqueline RESIGNED | Director | 18 Jun 2014 | 07 Nov 2014 | England | April 1973 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| JOYCE, Stephen Leonard RESIGNED | Director | 12 Mar 2002 | 25 Jan 2006 | | November 1949 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| KELLETT, Andrew John RESIGNED | Director | 01 Feb 2000 | 25 Jan 2006 | | July 1968 | Quest Diagnostics Ltd, Parkway West, Canford Lane, Heston, Middlesex, TW5 9QA |
| LUKAS, Michael Gregory RESIGNED | Director | 30 Sep 2008 | 15 Jul 2014 | Usa | March 1965 | Unit 1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| MACDONALD, Alasdair RESIGNED | Director | 10 Aug 2015 | 31 Dec 2018 | United Kingdom | June 1959 | 500, Brook Drive, Green Park, Reading, Berkshire, RG2 6UU, United Kingdom |
| MOHAPATRA, Surya Narayan RESIGNED | Director | 14 May 1999 | 20 Jun 2008 | | June 1949 | 202 Chestnut Ridge Road, Saddle River, Nj 07458, Usa |
| PREVOZNIK, Michael RESIGNED | Director | 05 May 2011 | 18 Nov 2014 | United States Of America | May 1961 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| SEXTON, Anita Jane RESIGNED | Director | 25 Jan 2006 | 14 Feb 2008 | | December 1968 | Unit B1, Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| SMITH, Linda Ellen RESIGNED | Director | 11 Jun 2008 | 18 Jun 2014 | Great Britain | April 1971 | Unit 1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| SUTTON, Norma RESIGNED | Director | 11 Jun 1999 | 02 Feb 2000 | | September 1946 | 22 Chelsea Crescent, Chelsea Harbour, London, SW10 0XB |
| THURLOW, Nicola Patricia RESIGNED | Director | 07 Nov 2014 | 19 Jan 2016 | United Kingdom | July 1959 | Unit B1 Parkway West, Cranford Lane, Hounslow, Middlesex, TW5 9QA |
| INSTANT COMPANIES LIMITED RESIGNED | Nominee Director | 14 Apr 1999 | 14 May 1999 | | | 1, Mitchell Lane, Bristol, Avon, BS1 6BU |