Achilleus Security – Shield | Colchester Security Services Achilleus – Shield is a family-run professional security provider delivering manned guarding, key holding, alarm response, mobile patrols & CCTV monitoring in Colchester & North Essex. Supported by the experience & standards of Achilleus Security Management, we protect commercial, industrial, construction & vacant properties with reliable, accountable security solutions. Our local teams provide 24/7 key holding & alarm response, mobile patrols, locking & unlocking & CCTV Monitoring. Known for our no-nonsense approach, fast response & safety-first operations, Achilleus Security – Shield helps businesses reduce risk & protect assets. Colchester & North Essex | Call Today