Security Installation Services Ltd provide a fast and efficient security service across Greater London and North Kent that includes the installation and maintenance of a wide range of leading security and access systems, to give you peace of mind for your home or business. - We use the highest quality and most technologically advanced security products available on the market today. - We source products from current, innovative, market leading suppliers and manufacturers. - We provide an exemplary after service with product guarantees, quick response product support and technical backup.