The Terrorism (Protection of Premises) Act applies to a wide range of premises and events where 200 or more people may be present at any one time. The legal requirement is the same for all — to implement reasonably practicable public protection measures that reduce the risk of harm from terrorism, in proportion to the nature, size, and use of each site.

Every organisation in scope must have clear, workable procedures for evacuation, invacuation, lockdown, and communication, specifically designed to address terrorism risks rather than standard health and safety scenarios. Duty holders may need to demonstrate how they determined what is reasonably practicable, showing how their actions balance risk, resources, and cost or effort to achieve proportionate, defensible compliance. Whether managing a single site or a complex national portfolio, the same principle applies — proportionate action, properly evidenced.