This Technical Bulletin No. 0050 from the National Security Inspectorate announces the publication of BS EN 50518:2019, which outlines the standards for Monitoring and Alarm Receiving Centres (ARCs). The new standard introduces two categories of ARCs, with Category I requiring higher construction and operational standards for security-related alarm systems, while Category II pertains to non-security applications. The bulletin details the immediate implementation timelines for both new applicants and existing approved companies, along with significant changes from previous standards, including updated requirements for physical security, alarm management systems, and operational procedures. Manual review may be necessary for complete understanding of all changes and requirements.