Introduce Martyn's Law
Conservative · what the evidence says
An independent, source-checked look at Conservative’s policy “Introduce Martyn's Law” — what it would actually do across the things that affect your life. Every claim below quotes the source behind it. How this works.
Personal liberty & free speech — Hurts
minor · moderate confidence
Martyn's Law requires thousands of venues to implement security measures including CCTV, access controls, and bag searches, imposing new state-backed compliance mandates on businesses and exposing individuals to increased surveillance and physical checks. The liberty cost is real but proportionate in scope, and the law has already received Royal Assent.
The evidence
- The policy requires premises to take proportionate steps to mitigate terrorism risks as a legal mandate. — conservatives.com (manifesto) — “requiring them to take proportionate steps to mitigate risks”
- Martyn's Law received Royal Assent on 3 April 2025 and is expected to come into force after at least 24 months. — homeofficemedia.blog.gov.uk (government) — “received Royal Assent on April 3, 2025, and is expected to come into force after an implementation period of at least 24 months”
- Enhanced Tier venues must implement physical security measures such as CCTV, access control, or bag searches. — cardinus.com (media) — “implement physical security measures (such as CCTV, access control, or bag searches)”
- The law applies to a very wide range of publicly accessible locations including retail, hospitality, education, worship, and health facilities. — secom.plc.uk (media) — “entertainment and leisure venues, hospitality, retail, sports facilities, visitor attractions, temporary events, places of worship, education facilities, and health facilities”
- Approximately 279,000 smaller venues would be subject to low-level compliance activities, with the Regulatory Policy Committee raising concerns about proportionality and lack of evidence of effectiveness. — secom.plc.uk (media) — “low-level activities required for approximately 279,000 smaller venues would effectively reduce terrorism”
Biggest unknown: Whether the 'proportionate steps' standard will be interpreted broadly or narrowly in practice — a strict interpretation across all 279,000 venues would significantly amplify the surveillance and intrusion burden on ordinary people.
Our reading: O10 is the home for negative liberty: new state-backed mandates, surveillance, and coercive compliance powers score as 'worsens' here, even if they plausibly improve safety (O5). Martyn's Law imposes legally enforceable compliance obligations on a very large number of venues — over 279,000 — spanning nearly every type of public space. For Enhanced Tier premises, the law specifically mandates CCTV, access controls, and bag searches: each is a direct intrusion on individual visitors (surveillance, physical search). The standard tier, while requiring no physical measures, still creates a compliance and training mandate on operators. The law thus introduces new state-backed coercion in two directions: on businesses (mandatory compliance duties) and on members of the public (exposure to routine surveillance and physical checks they cannot avoid without avoiding public life). The magnitude is assessed as minor rather than moderate because: the measures are described as 'proportionate'; the standard tier imposes no physical intrusions; and bag searches and CCTV already exist in many venues without a legal mandate. The law formalises and extends existing practice rather than creating a wholly new surveillance architecture. Confidence is moderate because the implementation detail (how strictly 'proportionate' is interpreted across 279,000 venues) is not yet settled, and the RPC itself found the impact assessment not fit for purpose, meaning the real-world scope of intrusion remains genuinely uncertain.
Crime, justice & national security — Helps
moderate · moderate confidence
Martyn's Law requires venues across the UK to prepare for terrorist attacks through risk assessments, security plans, and staff training — a broad, statutory improvement to protective security. The main caveat is that evidence on whether these requirements actually reduce casualties is contested, especially for smaller venues.
The evidence
- Martyn's Law has already received Royal Assent and stems from the Manchester Arena Inquiry recommendations. — homeofficemedia.blog.gov.uk (government) — “The legislation, which received Royal Assent on April 3, 2025, and is expected to come into force after an implementation period of at least 24 months, stems from the recommendations of the Manchester Arena Inquiry”
- The law's core aim is to improve protective security and organisational preparedness so venues can respond effectively in an attack. — homeofficemedia.blog.gov.uk (government) — “The core aim of Martyn's Law is to improve protective security and organizational preparedness across the UK, ensuring that venues are ready to respond effectively in the event of an attack”
- Enhanced-tier venues must undertake terrorism risk assessments, implement physical security measures, maintain a security plan, and appoint a senior compliance individual. — cardinus.com (media) — “these venues must undertake terrorism risk assessments, implement physical security measures (such as CCTV, access control, or bag searches), maintain a detailed security plan, and appoint a designated senior individual …”
- The law applies to a wide range of publicly accessible locations including entertainment, hospitality, retail, sports, places of worship, education, and health facilities. — secom.plc.uk (media) — “The law applies to a wide range of publicly accessible locations, including entertainment and leisure venues, hospitality, retail, sports facilities, visitor attractions, temporary events, places of worship, education fa…”
- Standard-tier venues (the majority, including ~279,000 smaller venues) have no requirement for physical security measures. — cardinus.com (media) — “There is no requirement for physical security measures in this tier”
- The Regulatory Policy Committee found insufficient evidence that low-level activities required for smaller venues would effectively reduce terrorism. — secom.plc.uk (media) — “lacked sufficient evidence to demonstrate that the low-level activities required for approximately 279,000 smaller venues would effectively reduce terrorism”
- 66% of consultation respondents disagreed with cost and benefit estimates, citing worries about business closures especially for small businesses and charities. — gov.uk (media) — “66% of respondents to a government consultation disagreed with the initial cost and benefit estimates, citing worries about additional costs, potential business closures (especially for small businesses, charities, and p…”
Biggest unknown: Whether the preparedness requirements — particularly for smaller standard-tier venues with no physical security obligations — translate into meaningfully reduced harm in a real attack.
Our reading: Martyn's Law introduces a statutory framework for terrorist attack preparedness across a very wide range of venues — a meaningful structural improvement for O5. For enhanced-tier venues, the requirements are substantive: risk assessments, physical security measures, security plans, and trained senior leads. This represents a real uplift in protective readiness for high-footfall locations such as large arenas, stadiums, and hospitals. The law's origins in the Manchester Arena Inquiry give it a direct evidential anchor: the inquiry identified failures of preparedness that cost lives, and the legislation directly targets those gaps. However, the approximately 279,000 standard-tier smaller venues face only soft preparedness obligations with no physical security requirement. The RPC explicitly found insufficient evidence that these low-level activities would reduce terrorism, which limits confidence that the policy's broadest coverage actually moves the safety needle. The policy's effect on O5 is therefore strongest in the enhanced tier and more uncertain for the standard tier. Absent the policy, there is no statutory baseline for venue preparedness, so the regime is genuinely additional. The time horizon is long-term given the 24-month minimum implementation period before it comes into force. Overall, the direction is improves — a statutory preparedness requirement covering thousands of venues represents a real enhancement to national protective security posture — but magnitude is moderate rather than major because the largest tranche of venues has weak obligations and evidence of population-scale effect on attack outcomes is not established.