This document is a guide detailing the Security Health Check advisory service designed to enhance a business's security posture and cyber defense capabilities. It outlines the process involved in assessing existing security measures, identifying potential threats, and defining a strategic approach to mitigate risks. The service includes conducting interviews with key stakeholders to evaluate current security controls and processes, followed by a gap analysis to highlight areas needing improvement. The guide presents a structured methodology that encompasses defining the scope and objectives, reviewing current controls, and providing a prioritized roadmap for enhancing security measures. Additionally, the service offers a report based on established frameworks, such as the Centre for Internet Security Critical Security Controls or NIST Cyber Framework, which includes best practice guidelines and a maturity level assessment. The document emphasizes the importance of addressing security gaps and provides a formal presentation of findings for stakeholder engagement.