The BS8418 is a British Standard that defines the requirements for the installation of CCTV systems in domestic and commercial properties. It was developed to ensure that CCTV systems are installed to a high standard and provide the best possible security for the premises. The BS8418 sets out the minimum requirements for the installation of CCTV systems, including the physical security of the system, the power supply, the installation of the cameras, the cabling, the recording and storage of images, and the management of the system. It also covers the use of the system, the maintenance of the system, and the legal aspects of the system. In short, the BS8418 provides a comprehensive set of guidelines for the installation and use of CCTV systems.