| TURPIN, Dawn Mary ACTIVE | Secretary | 01 May 2025 | | | | Lamorbey House, Lamorbey Park, Sidcup, Kent, DA15 9DF |
| HEALY, Michael ACTIVE | Director | 08 May 2025 | | England | June 1971 | Lamorbey House, Lamorbey Park, Sidcup, Kent, DA15 9DF |
| WHITTAKER, Randall Shanley, Professor ACTIVE | Director | 01 Sep 2023 | | England | September 1977 | Lamorbey House, Lamorbey Park, Sidcup, Kent, DA15 9DF |
| BERRY, Richard Curtis RESIGNED | Secretary | 01 Apr 1999 | 01 Nov 2003 | | | 7 Brook Park Close, London, N21 1RF |
| BOURNE, Ruth RESIGNED | Secretary | 10 Dec 2012 | 25 Apr 2019 | | | Lamorbey House, Lamorbey Park, Sidcup, Kent, DA15 9DF |
| CANNON, Robert Alexander Foux RESIGNED | Secretary | | 08 Mar 1995 | | | Orchard Cottage, Willow Vale, Chislehurst, Kent, BR7 5DF |
| LEADBEATER, Kenneth Frank Martin RESIGNED | Secretary | 08 Mar 1995 | 26 Mar 1999 | | | 46 Water Mill Way, South Darenth, Dartford, Kent, DA4 9BE |
| RIETKERK, Joanna RESIGNED | Secretary | 01 Mar 2005 | 15 Mar 2006 | | | 171 Upton Road, Bexleyheath, Kent, DA6 8LY |
| TAYLOR, Angela RESIGNED | Secretary | 01 Nov 2003 | 28 Feb 2005 | | | 102 Blandford Road, Beckenham, Kent, BR3 4NQ |
| TAYLOR, Patrick Anthony RESIGNED | Secretary | 16 Mar 2006 | 10 Dec 2012 | | | Apprentice House Garden, 29 Kersey Drive, South Croydon, CR2 8SX |
| CANNON, Robert Alexander Foux RESIGNED | Director | | 31 Aug 1997 | England | July 1947 | Orchard Cottage, Willow Vale, Chislehurst, Kent, BR7 5DF |
| EARLEY, Michael Thomas RESIGNED | Director | 02 Mar 2009 | 14 Sep 2017 | England | June 1947 | 12, Catmose Park Road, Oakham, Rutland, LE15 6HN |
| ELY, Robert Stephen, Professor Rs Ely RESIGNED | Director | 08 Mar 1995 | 31 Jul 2000 | | September 1955 | 2 Wolsey Mews, Green Street Green, Orpington, Kent, BR6 6LN |
| IDE, Christopher George RESIGNED | Director | 02 Mar 2009 | 31 Jul 2011 | United Kingdom | September 1950 | Haresfield, Packhorse Road, Sevenoaks, Kent, TN13 2QR |
| LOWE, Joseph Christopher RESIGNED | Director | 20 Sep 2022 | 01 Jul 2024 | England | May 1970 | Lamorbey House, Lamorbey Park, Sidcup, Kent, DA15 9DF |
| MIDDLETON, Susan Elizabeth Clarie RESIGNED | Director | 16 Feb 2018 | 30 Sep 2022 | England | November 1953 | Lamorbey House, Lamorbey Park, Sidcup, Kent, DA15 9DF |
| OLIVER, Mary Lyon, Ms. RESIGNED | Director | 22 Sep 2022 | 31 Aug 2023 | United Kingdom | September 1958 | Lamorbey House, Lamorbey Park, Sidcup, Kent, DA15 9DF |
| PEARCE, Alastair Tom Parslow, Professor RESIGNED | Director | 01 Jun 2001 | 07 Sep 2008 | England | December 1953 | Phoenix Cottage, Long Barn Road Weald, Sevenoaks, Kent, TN14 6NH |
| ROBINS, Phil Gerald RESIGNED | Director | | 02 Feb 1994 | England | December 1947 | Rosslyn 427 Footscray Road, New Eltham, London, SE9 3UL |
| ROSENBERG, Carol Susan, Dr RESIGNED | Director | | 31 Aug 2003 | | March 1951 | 1 Scotland Road, Buckhurst Hill, Essex, IG9 5NP |
| SCHLAEPFER, Rosemary RESIGNED | Director | 20 Nov 1997 | 18 Aug 2003 | | September 1948 | Hollands Farm House, Plaxdale Green Road, Stansted, Sevenoaks, Kent, TN15 7PB |
| TAYLOR, Patrick Anthony RESIGNED | Director | 05 Sep 2008 | 24 May 2009 | England | April 1942 | Apprentice House Garden, 29 Kersey Drive, South Croydon, CR2 8SX |
| WALKER, Andrew Guyon, Dr RESIGNED | Director | 14 Sep 2017 | 25 May 2018 | England | November 1963 | Lamorbey House, Lamorbey Park, Sidcup, Kent, DA15 9DF |