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Guard Mark Security is mainly serving in the Yorkshire & Humber, Northwest, Northeast, West Midlands and Greater London. Our Security Guarding Service, CCTV Monitoring, CCTV Towers, and Concrete Blocks services are available nationwide. All of our guards have security licences issued by the Security Industry Authority (SIA) and have passed the comprehensive screening and vetted to BS7858 standards to ensure a safe and secure environment.