Defined the criteria for determining the primary use of multi-purpose premises to clarify responsibilities under counter-terrorism protection laws.

These Regulations establish the legal criteria for identifying the "principal use" of a building or site that serves two or more purposes listed in Schedule 1 of the Terrorism (Protection of Premises) Act 2025.

The rules direct responsible persons to first evaluate the purpose and nature of the premises based on their physical design, continued use, and local authority treatment.

If a primary use remains unclear, the regulations mandate a secondary assessment of the time and space allocated to each activity.

These provisions apply to persons responsible for qualifying premises and events across England, Wales, Scotland, and Northern Ireland.

Established mandatory notification procedures and data requirements for venues and events covered by the Terrorism (Protection of Premises) Act 2025.

These regulations define the procedural and informational requirements for persons responsible for "qualifying premises" and "qualifying events" to notify the Security Industry Authority.

They establish specific timeframes for initial registration and the updating of inaccurate information, ranging from 14 to 28 days depending on the nature of the entity.

The regulations apply to owners and operators of venues and events across England, Wales, Scotland, and Northern Ireland that meet the criteria of the Terrorism (Protection of Premises) Act 2025, mandating the submission of detailed operational, contact, and licensing data via a specified online portal.

The Regulations brought sections 12(2)(a), (b), and (3), and sections 18(5) to (7) of the Terrorism (Protection of Premises) Act 2025 into force on 15th June 2026.

These Regulations, formally titled the Terrorism (Protection of Premises) Act 2025 (Commencement No. 2) Regulations 2026, specify that certain provisions of the primary 2025 Act will officially come into force on 15th June 2026.

Specifically, this commencement activates sections relating to the Security Industry Authority's (SIA) obligations to produce mandatory guidance, subject to the Secretary of State's approval, and the requirement for the SIA to produce and publish a statement detailing the constitution of 'qualifying worldwide revenue'.