This Technical Bulletin No. 0070 outlines the revisions to BS 5839-1:2025, which was published on April 30, 2025. It details the implementation timeline for NSI Fire Gold and Fire Silver approved companies, requiring compliance by October 31, 2025, and emphasizes that adherence to the new standard is mandatory for maintaining NSI approval. The document summarizes significant changes in the revised standard, including updates to scope, definitions, system responsibilities, and specific recommendations for fire detection and alarm systems, highlighting the importance of compliance for safety and regulatory purposes. Manual review may be needed for complete details on all changes.