| DELL, Blake Pieper ACTIVE | Director | 01 Jun 2024 | | United States | June 1985 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| EMBLETON, Alexa Jayne ACTIVE | Director | 01 Sep 2023 | | England | January 1983 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| FINCHER, Clenon Anderson ACTIVE | Director | 07 Sep 2022 | | United States | December 1970 | 2nd Floor, 38-43, Lincoln's Inn Fields, London, WC2A 3PE, United Kingdom |
| FITZGERALD, Patrick Tallman ACTIVE | Director | 01 May 2023 | | United States | October 1974 | 2nd Floor, 38-43, Lincoln's Inn Fields, London, WC2A 3PE, United Kingdom |
| FORMAN, Alistair William ACTIVE | Director | 01 Jun 2020 | | England | April 1975 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| HOGAN, Paul Lawrence ACTIVE | Director | 07 Sep 2022 | | United States | June 1969 | 2nd Floor, 38-43, Lincoln's Inn Fields, London, WC2A 3PE, United Kingdom |
| KIEFER, Michael Philip ACTIVE | Director | 01 May 2024 | | United States | October 1975 | Melton Ross Quarries, Melton Ross Quarries, Barnetby, DN38 6AE, England |
| MONTGOMERY, Kyle ACTIVE | Director | 01 Feb 2026 | | United States | September 1971 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| FORMAN, Patrick William RESIGNED | Secretary | | 18 Oct 2006 | | | The Orchard 19 East End, Kirmington, Ulceby, North Lincolnshire, DN39 6YS |
| ROBERTS, Donald RESIGNED | Secretary | 07 Sep 2022 | 01 May 2023 | | | 2nd Floor, 38-43, Lincoln's Inn Fields, London, WC2A 3PE, United Kingdom |
| TATTERTON, Ellen Patricia RESIGNED | Secretary | 18 Oct 2006 | 07 Sep 2022 | | | 18a, St. Erics Road, Doncaster, DN4 6NG, England |
| ALLDRIDGE, Kenneth Oliver RESIGNED | Director | | 01 Sep 1992 | | March 1955 | Sunnydene Albert Street, Brigg, South Humberside, DN20 8HU |
| ARNOTT, Edward George Robert RESIGNED | Director | 19 Jun 2023 | 14 Nov 2025 | England | July 1982 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| BENTHAM, Alan Alfred RESIGNED | Director | 18 Jul 2001 | 14 Jan 2005 | | June 1952 | Southfields, 18 Main Street, Bonby, North Lincolnshire, DN20 0PL |
| BIRD, Michael RESIGNED | Director | 11 Dec 1991 | 16 Apr 1999 | | April 1939 | Mount House Front Street, Ulceby, North Lincolnshire, DN39 6SY |
| BIRDEN, Daryl Weston RESIGNED | Director | 01 Apr 2004 | 26 Apr 2013 | England | August 1966 | 4 Westcote Farm, Wold Road, Barrow Upon Humber, North Lincolnshire, DN19 7DY |
| BOAST, Nevison George RESIGNED | Director | 01 Apr 1996 | 17 Jul 2002 | | January 1934 | Laringaseta 23 Church Street, Elsham, Brigg, North Lincolnshire, DN20 0RG |
| COUNSELL, Stuart Robin RESIGNED | Director | 20 Jul 2011 | 07 Sep 2022 | England | August 1950 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| CROFT, Christel Marie-Claude, Dr RESIGNED | Director | 01 Apr 2022 | 10 Mar 2023 | England | March 1969 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| DEAS, Colin RESIGNED | Director | 27 Feb 2007 | 01 Dec 2009 | United Kingdom | June 1953 | The Croft, Station Road, North Thoresby, Grimsby, South Humberside, DN36 5QS |
| FORMAN, Patrick William RESIGNED | Director | | 10 Feb 2007 | | February 1947 | The Orchard 19 East End, Kirmington, Ulceby, North Lincolnshire, DN39 6YS |
| FOSTER, Stephen William RESIGNED | Director | 23 Mar 2016 | 31 Oct 2019 | England | October 1962 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| GARDINER, Martyn John, Air Vice-Marshal RESIGNED | Director | 07 Jun 2012 | 14 Jul 2021 | England | June 1946 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| HAWORTH, Martin David RESIGNED | Director | 01 Apr 2005 | 31 Mar 2022 | England | January 1963 | Cleatham House, 17 Queens Road, Barnetby, South Humberside, DN38 6JH |
| HENKEN, Arthur RESIGNED | Director | 07 Sep 2022 | 26 Jan 2024 | United States | April 1967 | 2nd Floor, 38-43, Lincoln's Inn Fields, London, WC2A 3PE, United Kingdom |
| HIBBARD, Peter RESIGNED | Director | | 14 Nov 2006 | | August 1950 | 28 Church Street, Elsham, Brigg, North Lincolnshire, DN20 ORG |
| HOLMES, Oliver Morel RESIGNED | Director | 28 Jul 1999 | 20 Jul 2011 | United Kingdom | July 1939 | Holly Cottage, Main Road, Knockholt, Kent, TN14 7LT |
| MARTIN, Alan Gould RESIGNED | Director | | 20 Jul 2000 | | January 1920 | Huby House Strait Lane, Huby, Leeds, West Yorkshire, LS17 0EA |
| MORRIS, David James RESIGNED | Director | | 17 Jul 2013 | England | May 1943 | 37 Clarendon Drive, Putney, London, SW15 1AW |
| OWEN, Ronald James RESIGNED | Director | | 17 Jul 1996 | | August 1925 | Paradise Wood, Upper Hartfield, E Sussex, TN7 4DY |
| PALMER, Ian Hedley RESIGNED | Director | | 18 Jul 2012 | United Kingdom | December 1941 | Meadoway 14 Church Street, Elsham, Brigg, North Lincolnshire, DN20 0RG |
| RICHARDS, John Paul RESIGNED | Director | 14 Jul 2021 | 07 Sep 2022 | England | January 1949 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| ROBERTS, Donald RESIGNED | Director | 07 Sep 2022 | 01 May 2023 | United States | February 1957 | 2nd Floor, 38-43, Lincoln's Inn Fields, London, WC2A 3PE, United Kingdom |
| SEDGWICK, Ian Peter RESIGNED | Director | 14 Dec 1995 | 31 Jul 1998 | United Kingdom | October 1935 | Burrows Dene Tilford Road, Farnham, Surrey, GU9 8JA |
| STANSFIELD, Richard Mark RESIGNED | Director | 01 Apr 2005 | 01 Jun 2024 | England | May 1967 | 42, Queen Street, Kirton Lindsey, Gainsborough, Lincolnshire, DN21 4NX, England |
| SUGDEN-BROOK, Wesley David RESIGNED | Director | 13 Feb 2023 | 20 May 2025 | England | September 1977 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| TATTERTON, Ellen Patricia RESIGNED | Director | 23 Jul 2008 | 31 Aug 2023 | England | July 1961 | Singleton Birch Limited, Melton Ross Quarries, Barnetby, North Lincolnshire, DN38 6AE, United Kingdom |
| VENHAUS, David RESIGNED | Director | 07 Sep 2022 | 30 Apr 2024 | United States | March 1974 | 2nd Floor, 38-43, Lincoln's Inn Fields, London, WC2A 3PE, United Kingdom |