The document “NSF-700.15-NACOSS-Gold-and-Systems-Silver-Scheme-Standards-Aug-2021” outlines the mandatory and optional British Standards and NSI Codes of Practice required for companies seeking approval under the NACOSS Gold and Systems Silver schemes. It specifies essential standards for various security systems, including intruder alarms, CCTV, and access control, and provides guidance on compliance and the necessary audits for approval. Additionally, it includes information on accessing relevant standards and codes of practice for NSI-approved companies.