In response to increasing threats of terrorism and the urgent need to enhance public safety, the UK government is introducing Martyn's Law, also known as the Protect Duty. Named in honour of Martyn Hett, a victim of the 2017 Manchester Arena attack, this legislation aims to establish a cohesive and robust framework to protect public spaces from terrorist attacks. This session will provide an in-depth understanding of Martyn's Law, its legal implications, and practical steps for effective preparation for Museums, Visitor Attractions, and other public spaces with capacity to host 100+ visitors.