The British Fenestration Rating Council (BFRC) has announced a new IGU Evaluation Service to assess insulated glass unit performance in the UK. The move comes as energy efficiency regulations tighten and the industry adjusts to post-Brexit standards divergence. Key questions remain unanswered: whether participation is mandatory, how the service differs from existing EN 1279 certification routes, and whether it will eventually become a prerequisite for the Window Energy Rating scheme. Manufacturers and fabricators await clarity on costs, timelines, and alignment with Building Regulations Part L requirements.