MJF - MJF homepage - MJF home MJF Security’s principal business activity is the provision of security services to a wide range of business end users including Local Authorities, Universities, Schools, Libraries, and many blue chip public and private companies. We provide licensed and trained security personnel as CCTV control room operators, static guards, mobile patrols, key holding and alarm response, and remote CCTV monitoring. These services are all covered by the scope of our SIA/ACS and NSI Gold accreditations.