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Find out about terrorist threat levels, national measures against terrorism and how to report suspect activity

• Terrorism threat levels

  The threat level indicates the likelihood of a terrorist attack in the UK.…

• Counter-terrorism

  The Security Service (MI5) is responsible for protecting the UK against…

• Reporting suspected terrorism

  If you suspect someone is involved in terrorism in any way: call the…

• National emergencies

  National Risk Register The government regularly assesses the natural…

How to minimise your risk, and what to do if there's a terrorist attack.

• Updated: 22 November 2023

How to use a quasi-experimental study to evaluate your digital health product.

• Updated: 8 September 2021

Design, build and operate APIs in a consistent way

• Updated: 19 July 2024

Guidance to help you assess if artificial intelligence (AI) is the right technology for your challenge.

• Updated: 10 June 2019

Having right of abode means you're allowed to live or work in the UK without any immigration restrictions - apply for a certificate of entitlement to prove you have it.

Apply for a Global Talent visa to work in the arts, sciences or digital technology once you have been endorsed as a leader or potential leader.

As a supplier, find out how to work with us. There are various routes you can follow.

• Updated: 25 September 2025

Guidance on choosing evaluation study types and methods.

• Updated: 2 December 2020

You have the right to speak for yourself in court without a solicitor or legal professional - where to get help with papers and procedures