| ROBINSON, Mary Louise ACTIVE | Secretary | 12 Mar 2025 | | | | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| LAIHO, Andrew Iver ACTIVE | Director | 09 Jan 2025 | | United States | September 1973 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| ROWELL, Simon Christopher, Dr ACTIVE | Director | 12 Mar 2025 | | England | March 1973 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| XUE, Yunxuan ACTIVE | Director | 27 Apr 2022 | | China | October 1986 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| BARTLEY, Nigel James RESIGNED | Secretary | 29 Aug 2017 | 01 Apr 2019 | | | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| BEASLEY, Christopher Ernest RESIGNED | Secretary | | 13 May 1998 | | | 213a Archway Road, Highgate, London, N6 5BN |
| RUSSON, Kevin RESIGNED | Secretary | 07 Nov 2008 | 05 Jun 2014 | | | 17, Burghley Drive, Meadow View, Stockton-On-Tees, Cleveland, TS17 5GN |
| SMITH, Nicholas Handran RESIGNED | Secretary | 13 May 1998 | 01 Aug 2000 | | | Flat 5, 24 Warrington Crescent, London, W9 1EL |
| STAPLETON, Geneva Angela RESIGNED | Secretary | 01 Jun 2001 | 07 Nov 2008 | | | 38 Malthouse Green, Wigmore Park, Luton, Bedfordshire, LU2 8SN |
| WHALLEY, Amanda RESIGNED | Secretary | 01 Aug 2000 | 01 Jun 2001 | | | 12 Merchant Court, 61 Wapping Wall Wapping, London, E1W 3SD |
| WILSON, Carl Thomas RESIGNED | Secretary | 21 May 2020 | 12 Mar 2025 | | | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| ANDERSON, Alexander Mclennan RESIGNED | Director | | 31 May 1998 | | September 1936 | The Howe Felixkirk, Osgoodby, Thirsk, North Yorkshire, YO7 2AP |
| ANDREWS, Donald Charles Mackenzie RESIGNED | Director | 19 Jun 2001 | 17 Oct 2008 | United Kingdom | August 1960 | The White House, 45 Kimbolton Road, Bedford, MK40 2PG |
| BEASLEY, Christopher Ernest RESIGNED | Director | | 13 May 1998 | | May 1952 | 213a Archway Road, Highgate, London, N6 5BN |
| BOLLAERT, Tom Maria Jules RESIGNED | Director | 23 Nov 2022 | 09 Jan 2025 | England | June 1971 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| BROWN, John Allan RESIGNED | Director | 24 Jun 1997 | 20 Jun 2001 | England | December 1962 | 37 Observatory Road, London, SW14 7QB |
| CATCHPOLE, Steven Leslie RESIGNED | Director | 07 Nov 2008 | 12 Nov 2013 | United Kingdom | February 1960 | 1, Dellbrook, Hubert Road, Winchester, Hampshire, SO23 9RG |
| DAVIDSON, Brian Joseph RESIGNED | Director | 08 Oct 2014 | 04 Nov 2015 | England | March 1963 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| DIETRICH, Andreas RESIGNED | Director | 12 Apr 2017 | 29 Mar 2018 | Germany | October 1962 | 29 Loetsch, L-7640 Christnach, Luxembourg |
| DOUGLAS, John Alexander George RESIGNED | Director | 05 Jun 2014 | 30 Jun 2017 | Scotland | August 1964 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| GOWLAND, Christopher David RESIGNED | Director | 04 Nov 2015 | 12 May 2017 | United Kingdom | September 1969 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| HAMILTON, John Lambert RESIGNED | Director | 03 May 2002 | 25 Feb 2005 | England | July 1951 | The Poplars, 1 Eythrope Road, Stone, Buckinghamshire, HP17 8PH |
| HANSON, Keith RESIGNED | Director | 31 Oct 2008 | 12 Nov 2013 | United Kingdom | August 1957 | 7, Rowland Crescent, Castle Eden, Hartlepool, Cleveland, TS27 4FE |
| JACKSON, Arthur, Dr RESIGNED | Director | | 01 Jan 2003 | | March 1942 | Glebe House Village Lane, Washington, Tyne & Wear, NE38 7HY |
| KINGSBURY, Lee Paul RESIGNED | Director | 12 Nov 2013 | 12 May 2023 | United Kingdom | December 1972 | Seal Sands, Middlesbrough, TS2 1UB, England |
| KITTLER, Matthias RESIGNED | Director | 28 Aug 2008 | 07 Nov 2008 | Germany | November 1971 | 37, Knaackstrasse, 10435 Berlin, Germany |
| KITTLER, Matthias RESIGNED | Director | 22 Aug 2008 | 23 Aug 2008 | Germany | November 1971 | 37, Knaackstrasse, 10435 Berlin, Germany |
| LAW, John Derek RESIGNED | Director | | 26 Jun 1998 | | May 1957 | 44 Camlet Way, St Albans, Hertfordshire, AL3 4TL |
| LIGHTWING, Julian Thomas RESIGNED | Director | 01 Jan 2020 | 10 Oct 2022 | United Kingdom | September 1972 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| LIGHTWING, Julian Thomas RESIGNED | Director | 04 Nov 2015 | 12 Apr 2017 | United Kingdom | September 1972 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| MACLEOD, Nigel RESIGNED | Director | 28 Aug 2008 | 07 Nov 2008 | United Kingdom | June 1961 | 15b Smithfield End, Swanbourne, Milton Keynes, Buckinghamshire, MK17 0SP |
| MACLEOD, Nigel RESIGNED | Director | 22 Aug 2008 | 23 Aug 2008 | United Kingdom | June 1961 | 15b Smithfield End, Swanbourne, Milton Keynes, Buckinghamshire, MK17 0SP |
| MINTON, Kenneth Joseph RESIGNED | Director | | 18 Mar 1993 | United Kingdom | January 1937 | 7 Midway, St Albans, Hertfordshire, AL3 4BD |
| MORGAN, Michael Craig, Dr RESIGNED | Director | 15 Aug 2014 | 12 Aug 2015 | England | May 1968 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| MORGAN, Michael Craig, Dr RESIGNED | Director | 07 Nov 2008 | 15 Aug 2014 | United Kingdom | May 1968 | 6, Manor Close, Wolviston, Billingham, Cleveland, TS22 5QA |
| PARKINSON, Nigel Christopher, Dr RESIGNED | Director | 29 Mar 2018 | 31 Dec 2019 | United Kingdom | January 1968 | -, -, Seal Sands, Middlesbrough, Cleveland, TS2 1UB |
| PARKINSON, Nigel Christopher, Dr RESIGNED | Director | 12 Nov 2013 | 12 Apr 2017 | United Kingdom | January 1968 | Seal Sands, Middlesbrough, TS2 1UB, United Kingdom |
| RANKIN, Clive Taunton, Dr RESIGNED | Director | 11 May 2001 | 31 Oct 2003 | England | September 1946 | 13 Greville House, Kinnerton Street, London, SW1X 8EY |
| RODGER, Peter Robert Charles RESIGNED | Director | 19 Jun 2001 | 31 Jul 2003 | United Kingdom | June 1951 | 16 Links Road, Flackwell Heath, High Wycombe, Buckinghamshire, HP10 9LY |
| RUSSON, Kevin RESIGNED | Director | 07 Nov 2008 | 05 Jun 2014 | United Kingdom | May 1958 | 17, Burghley Drive, Meadow View, Stockton-On-Tees, Cleveland, TS17 5GN |
| SAVAGE, Andrew John RESIGNED | Director | 19 Jun 2001 | 28 Feb 2003 | United Kingdom | June 1947 | 2 Griggs Orchard, Church Road, Sherington, Buckinghamshire, MK16 9PL |
| SCULL, Andrew James RESIGNED | Director | | 25 Jun 1997 | | April 1956 | 2 The Granary Brickwall Farm, Kiln Lane Clophill, Bedford, Bedfordshire, MK45 4DA |
| SMITH, Nicholas Handran RESIGNED | Director | 13 May 1998 | 30 Sep 2001 | | March 1949 | Flat 5, 24 Warrington Crescent, London, W9 1EL |
| TAYLOR, Robert, Dr RESIGNED | Director | 25 Mar 1999 | 08 May 2001 | | May 1946 | 33 Red Crest Gardens, Camberley, Surrey, GU15 2DU |
| TWENTYMAN, Judith RESIGNED | Director | 01 Jul 1998 | 20 Jun 2001 | | March 1964 | 17 Theberton Street, London, N1 0QY |
| XU, Minghui RESIGNED | Director | 12 Apr 2017 | 27 Apr 2022 | China | February 1971 | 8 Yongjiao Road, Huangyan Economic Development Zone, Taizhou City, Zhejiang Province |