NSI Technical Bulletin No. 0013 provides guidance on the implementation of PD 6662: 2010, which outlines the application of European standards for intrusion and hold-up alarm systems. Key changes include the transition period allowing installation under the previous PD until May 31, 2012, and the requirement for all systems to comply with the new PD from June 1, 2012. The bulletin details the new standards called up by the PD, including BS EN 50131 series and BS 8243: 2010, which must be adhered to for compliance and maintaining NSI approvals. Manual review is recommended for complete details on specific requirements and standards.