The Steering Committee for the GeoPT proficiency testing programme includes:

• Peter Webb, The Open University, Milton Keynes;
• M. Thompson, Birkbeck College, University of London; and
• P.J. Potts,The Open University, Milton Keynes.

If you would like to participate in future proficiency testing rounds organised for geochemical laboratories, please register by printing, completing and submitting the application form at the end of this page