Terrorism Act 2025 SIA duties start 15 June 2026
On 10 June 2026, the Secretary of State used the power in section 37(2)(b) of the Terrorism (Protection of Premises) Act 2025 to make a new statutory instrument. Published by the Home Office on legislation.gov.uk and signed by Minister of State Dan Jarvis, it brings another set of provisions from the Act into force on 15 June 2026. If that sounds dry, here is the plain-English version: this is not the whole Act starting at once. It is one more legal step that turns on specific sections of the 2025 law, and this time the focus is on what the Security Industry Authority, or SIA, must publish.
The full title is the Terrorism (Protection of Premises) Act 2025 (Commencement No. 2) Regulations 2026. The words "Commencement No. 2" matter because they tell us this is the second set of start-date rules made under the Act. The explanatory note says other parts of the law had already been brought into force by earlier commencement regulations. This is how a lot of legislation works in practice. Parliament passes the main Act, but some sections only begin later, on dates chosen through separate commencement regulations. That gives government and regulators time to prepare guidance, approvals and public paperwork before every part of the system is live.
From 15 June 2026, section 12(2) and (3) begin to operate, except for section 12(2)(c), which is not being switched on yet. According to the explanatory note on legislation.gov.uk, these provisions relate to Security Industry Authority guidance and advice. In practical terms, the SIA must produce guidance, get it approved by the Secretary of State, publish it once approved, and review it after publication. For anyone trying to understand public protection policy, that matters because guidance is often where legal duties become readable. It helps turn formal law into something people can actually follow.
The same regulations also activate section 18(5) to (7) on 15 June 2026. These clauses require the SIA to produce a statement about the constitution of "qualifying worldwide revenue". That statement must be published and laid before Parliament. The phrase is technical, but the basic point is clear enough: the regulator must explain what counts as qualifying worldwide revenue for the purposes of the Act. Publishing that statement, and placing it before Parliament, means the definition is part of the public record rather than something left unclear or buried in internal process.
It is worth noticing what these regulations do not do. They do not themselves publish the guidance. They do not themselves set out the SIA's revenue statement. What they do is start the legal duty for those documents to exist, be approved where required, and be made public. That may sound like a small administrative move, but it tells you something important about how public protection law is built. Before a regulator can apply a system fairly, there usually needs to be a clear paper trail showing what the guidance says, who approved it, and what official definitions will be used.
The explanatory note also points readers to the Act's impact assessment, available through Parliament's publications service, and says printed copies can be requested from the Protect and Prepare Unit, Homeland Security Group, Home Office, 2 Marsham Street, London SW1P 4DF. So the key date here is 15 June 2026. From that day, selected publication and review duties for the Security Industry Authority are live under the Terrorism (Protection of Premises) Act 2025. If you want to understand how a major law starts working in real life, this is a useful example: first the Act exists, then specific sections are commenced, and only then do the practical guidance documents begin to appear.