The Terrorism (Protection of Premises) Act 2025 (Commencement No. 2) Regulations 2026, published on 10 June, switch on several core provisions of the Act on 15 June.
Two matter most. Section 12 places a statutory duty on the Security Industry Authority to produce guidance on how it will exercise its regulatory functions, with that guidance subject to the Secretary of State's approval before publication. Sections 18(5) to (7) require the SIA to lay before Parliament a statement defining "qualifying worldwide revenue" — the threshold concept that helps decide which premises fall into the more demanding enhanced tier.
The timing lines up with the consultation. The SIA's public consultation on its draft section 12 guidance closed on 12 June, and responses are now being analysed ahead of Board and Ministerial sign-off.
For security contractors and the venues and event organisers they serve, this is the moment the enforcement machinery becomes real rather than theoretical. The finalised section 12 guidance will set how the regulator uses its discretion in practice — what good looks like, and where it will push. Track it as it lands, and read your clients' obligations against it early, because the tier a site sits in drives the cost and the scope of what you will be asked to deliver.
