This Published Document is a background paper that gives non-contradictory complementary information for use in the UK with BS EN 1992-1:2004, BS EN 2:2004, BS EN 1992-3:2006, and their UK National Annexes. This Published Document gives: background to the decisions made in the National Annexes for some of the Nationally Determined Parameters; commentary on some specific subclauses from BS EN 1992-1:2004, BS EN 2:2004 and BS EN 1992-3:2006; and reference to the requirements of the building regulations in the UK [1,2] that are not covered in BS EN 1992-1-1:2004, BS EN 1992-1-2:2004, BS EN 1992-3:2006 and their UK National Annexes. NOTE During the early stages of implementation of BS EN 1992 (all parts), all the related European standards and their UK National Annexes might not be available in their final form. Therefore, guidance on the standards that can be used in conjunction with BS EN 1992-1 (all parts) during the early stages of its implementation is given in Annex A.