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GREATER LONDON · ENGLAND

Martyn’s Law in City of London, London

The Square Mile has a small resident population but draws very large numbers of workers, commuters and visitors every weekday. The Barbican Centre, St Paul's Cathedral, Leadenhall Market and the busy termini at Liverpool Street and Fenchurch Street create dense crowds in a compact area. Unlike the rest of London, the City has its own police force, and the City of London Corporation is the licensing authority.

Regulator
Security Industry Authority (SIA)
Licensing authority
City of London Corporation
Police force
City of London Police
Duties expected
spring 2027

Does Martyn’s Law apply to your venue?

Five quick questions. About a minute. A preliminary check, not legal advice.

2. Is that the main use of the building, or the part of it you control?
Include staff, contractors and volunteers. Count regular busy times, not a one-off you could not expect.
people
4. How many premises?
5. Do you hold events for 800 or more people?

Choose your type of premises to see your result.

A guide only, based on the Act and Home Office guidance. Your tier depends on the full rules, including exclusions and premises within larger premises.

Where the law will bite in City of London

Venues likely to be in scope include office buildings with public areas, arts and conference centres, places of worship and heritage sites, bars and restaurants, major railway stations. Areas with a high concentration of qualifying premises include:

  • Bank and the financial district
  • Barbican
  • Leadenhall Market
  • St Paul's

Any premises in City of London where 200 or more people can reasonably be present at once needs to prepare, from a single pub to a stadium. Use the free tier checker to see where you stand.

What venues in City of London need to do

Standard tier (200 to 799 people): have procedures for evacuation, invacuation, lockdown and communication, make sure staff know what to do, and notify the SIA. There is no legal requirement for building works. See the four procedures explained.

Enhanced tier (800 or more): all of the above, plus documented public protection measures provided to the SIA and, for organisations, a designated senior individual. See enhanced tier duties.

The Act applies across England, and the Security Industry Authority (SIA) regulates it. Your council remains your licensing authority, but it is not the Martyn's Law regulator.

Local contacts and support

  • City of London Corporation handles your premises licence. Keep your licence conditions, fire risk assessment and Martyn’s Law procedures consistent.
  • City of London Police provides protective security advice through Counter Terrorism Security Advisers.
  • ProtectUK offers free official training, including ACT awareness e-learning. See our guide to free training and resources.

Guides for City of London’s main venue types

Frequently asked questions

Does Martyn's Law apply to venues in City of London?

Yes, if your premises qualifies. The law covers premises in City of London where 200 or more people can reasonably be expected to be present at the same time, and certain events of 800 or more. Premises with 800 or more fall into the enhanced tier, except places of worship, early years settings, schools and further education, which stay in the standard tier.

Who enforces Martyn's Law in City of London?

The Security Industry Authority (SIA) regulates Martyn's Law across the UK, including City of London. City of London Corporation is not the regulator for these duties, although your licensing and fire safety obligations still apply.

When do the duties start in City of London?

The duties are expected to come into force in spring 2027, at the same time across the UK. Existing premises will then have three months to notify the SIA.

Where can venues in City of London get local security advice?

City of London Police can provide counter terrorism protective security advice through its Counter Terrorism Security Advisers, and free training is available through ProtectUK. Report suspicious activity to the police on 999 in an emergency, or through gov.uk/ACT.