National Security Bill

The National Security Bill announced in the King's Speech 2026 sits on top of three pre-existing layers of UK counter-terrorism and state-threats law: the Terrorism Act 2000 / Terrorism Act 2006 / Counter-Terrorism and Border Security Act 2019 trio (proscription, s.13 wearing/displaying, Schedule 7/Schedule 3 port examination); the TPIM Act 2011 risk-management regime; and the National Security Act 2023 (modernised espionage, foreign interference, sabotage, prohibited places, STPIMs) 12. The operational baseline for counter-terrorism policing is settled: SI 2025/1040 brought revised Schedule 3 and Schedule 7 codes of practice into force on 14 October 2025. The headline Bill, however, has a different framing — 'extreme violence' and the response to the Southport attack — and its precise content is not yet on the record. The most concrete legislative work in this space is being progressed via the Crime and Policing Bill's Economic Note 1009, which sets out five counter-terrorism measures: a Youth Diversion Order for under-21s; broadening the TPIM/STPIM weapons definition to cover bladed articles; extending s.13 TACT 2000 seizure powers; applying s.13 in prisons and other detention settings; and managing historic terrorist-connected offenders. The Security Minister's recent national-security update to Parliament (May 2026) frames the threat level the Bill is responding to 3.

Five developments in the last three months matter. First, the King's Speech 2026 on 13 May named the National Security Bill as the legislative response to the Southport attack 1. Second, the Home Office's Crime and Policing Act 2026 counter-terrorism and national security factsheet was published on 12 May 2026, setting out the measures the Government is progressing in parallel to the headline Bill. Third, the Security Minister's update on 14 May covered the threat picture and the increase in the national threat level 2. Fourth, the Southport Inquiry Phase 1 report was published on 13 April 2026 3 — the evidence base cited in the King's Speech framing. Fifth, the Commons debated National Security on 23 April 2026, with parallel attention from the Joint Committee on the National Security Strategy in its non-inquiry session 'National security assessment and COP-17'. The independent Prevent learning review on the Southport attack (June 2025) 4 remains the second evidentiary pillar.

Three things matter most over the next 12 months. First, the division of counter-terrorism measures between vehicles. The Crime and Policing Bill is already carrying five operational measures via EN 1009 — Youth Diversion Order; TPIM/STPIM weapons definition; s.13 TACT 2000 seizure; s.13 application in prisons; management of historic terrorist-connected offenders. If the National Security Bill duplicates or re-houses any of these, expect a parliamentary intelligibility row. Second, the 'extreme violence' framing. The Bill is positioned as a response to the Southport attack 1, but Southport was not classified as a terrorism offence under existing law. Whether the Bill creates a new offence category, modifies the terrorism statutory definition, or operates principally through risk-management orders and Prevent reform is the principal open design question — and the Southport Inquiry Phase 1 report will be the document Parliament cites against the Government's proposals 2. Third, rights scrutiny. The Joint Committee on Human Rights will re-apply its 2022 critique of the predecessor Bill — SOIOTUK clarity, breadth of 'foreign power', absence of a whistleblowing defence, the support/assistance ground — to the 2026 vehicle 3. The IRTL's recommendations sourced to four of the five EN 1009 measures gives the Government significant cover on the technical measures; the contested ground will be any new offences the National Security Bill itself introduces beyond IRTL-endorsed asks.

The most material uncertainty is content: the King's Speech text 1 gives almost no doctrinal detail beyond the Southport framing, and the foundational documents available for this build are heavily weighted toward the National Security Act 2023 / 2022 Bill heritage (factsheet suite 2, JCHR response 3) rather than the 2026 vehicle itself. Inferred from corpus gap: the King's Speech Background Briefing Notes (referenced in the metadata) and a dedicated 2026 Bill explanatory note are not in the readable corpus for this build, so the analysis cannot yet specify which clauses sit in the National Security Bill versus the Crime and Policing Bill. A second uncertainty is the relationship between the National Security Bill and the separately-announced Tackling State Threats Bill 1 — without the published bills it is not possible to say whether espionage / foreign interference provisions are being re-opened. Third, the temporal interplay with the Southport Inquiry is unresolved: Phase 1 is published 4 but later phases may produce findings that arrive after the Bill is introduced, raising amendment risk.