Technical Bulletin No. 0031 provides guidance on the implementation of BS 7984-1:2016, the updated British Standard for keyholding and response services, which supersedes the previous version from 2008. The bulletin outlines mandatory compliance requirements for NSI approval, including immediate auditing for applicant companies and a deadline for existing approved companies to transition to the new standard by August 2017. Key changes include updated definitions, enhanced training requirements for personnel, and specific guidelines regarding the management and security of keys, emphasizing the importance of compliance for maintaining NSI accreditation. Manual review recommended for complete details.