Two New Bailey is a 10-storey purpose-built office building including basement car park and flexible use areas. A key architectural concept for the design was the external steel structure. Maze personnel developed the fire strategy design for the project including a detailed analysis of the potential influence of an internal fire on the external structure with the aim of evaluating the fire protection requirements for these structural elements. The desktop analysis was based on the methodology in Annex B of EN 1991-1-2 (with due cognisance of the associated National Annex) and, following the QDR process of BS 7974 the analysis was discussed with the Regulatory Authorities both pre- and post-completion with the result being an optimised fire protection regime which assisted in realising the architectural intent.