science

UK Threat Levels

UK Threat Levels is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand UK Threat Levels rather than just read about it. In short: The United Kingdom Terror Threat Levels, often referred to as UK Threat Levels, are the alert states that have been in use since 1 August 2006 by the British government to warn of forms of terrorist activity. In September 2010, the threat levels for Northern Ireland-related terrorism were also made available.

Key takeaways

UK Threat Levels belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect UK Threat Levels to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of UK Threat Levels from memory before moving on to harder problems.

Reference excerpt

The United Kingdom Terror Threat Levels, often referred to as UK Threat Levels, are the alert states that have been in use since 1 August 2006 by the British government to warn of forms of terrorist activity. In September 2010, the threat levels for Northern Ireland-related terrorism were also made available. In July 2019, changes were made to the terrorism threat level system, to reflect the threat posed by all forms of terrorism, irrespective of ideology. There is now a single national threat level describing the threat to the UK, which includes Islamist, Northern Ireland, left-wing and right-wing terrorism. Before 2006, a colour-based alert scheme known as BIKINI state was used. The response indicates how government departments and agencies and their staffs should react to each threat level.

Categories of threat Since 23 July 2019, the Home Office has reported two different categories of terrorist threat:

National Threat Level. Northern Ireland-related Threat Level to Northern Ireland Previously, since 24 September 2010, the Home Office has reported three different categories of terrorist threat:

Threat from international terrorism. Terrorism threat related to Northern Ireland in Northern Ireland itself. Terrorism threat related to Northern Ireland in Great Britain (i.e. excluding Northern Ireland). A fourth category of terrorist threat is also assessed but is not disclosed, relating to threats to sectors of the UK's critical national infrastructure such as the London Underground, National Rail network and power stations. The Joint Terrorism Analysis Centre (JTAC) is responsible for setting the threat level from international terrorism and the Security Service (MI5) is responsible for setting both threat levels related to Northern Ireland. The threat level informs decisions on protective security measures taken by public bodies, the police and the transport sector.

Threat levels

Threat Levels are decided using the following information:

Available intelligence. It is rare that specific threat information is available and can be relied upon. More often, judgements about the threat will be based on a wide range of information, which is often fragmentary, including the level and nature of current terrorist activity, comparison with events in other countries and previous attacks. Intelligence is only ever likely to reveal part of the picture. Terrorist capability. An examination of what is known about the capabilities of the terrorists in question and the method they may use based on previous attacks or from intelligence. This would also analyse the potential scale of the attack. Terrorist intentions. Using intelligence and publicly available information to examine the overall aims of the terrorists and the ways they may achieve them including what sort of targets they would consider attacking. Timescale. The threat level expresses the likelihood of an attack in the near term. We know from past incidents that some attacks take years to plan, while others are put together more quickly. In the absence of specific intelligence, a judgement will need to be made about how close an attack might be to fruition. Threat levels do not have any set expiry date, but are regularly subject to review in order to ensure that they remain current.

History Threat levels were originally produced by MI5's Counter-Terrorism Analysis Centre for internal use within the British government. Assessments known as Security Service Threat Reports or Security Service Reports were issued to assess the level of threat to British interests in a given country or region. They had six levels: Imminent, High, Significant, Moderate, Low and Negligible. Following terrorist attacks in Indonesia in 2002, the system was criticised by the Intelligence and Security Committee of Parliament (ISC) as insufficiently clear and needing to be of greater use to "customer departments". The 7 July 2005 London bombings prompted the government to update the threat level system following a recommendation from the ISC that it should deliver "a greater transparency of the threat level and alert systems as a whole, and in particular [it is recommended] that more thought is given to what is put in the public domain about the level of threat and required level of alert." The system was accordingly simplified and made easier to understand. Since 2006, MI5 and the Home Office have published international terrorism threat levels for the entire UK on their websites, and since 2010 they have also published threat levels for Northern Ireland, with separate threat levels for Northern Ireland and the rest of the UK.

2019 'New Reporting Format' In July 2019, changes were made to the terrorism threat level system creating a 'New Format' of threat levels, to reflect the threat posed by all forms of terrorism, irrespective of ideology or motivation.

Changes to threat levels The following table records changes to the threat levels from July 2019 – Present:

Old-format historical threat levels Since 2006, information about the national threat level has been available on the MI5 and Home Office websites. In September 2010 the threat levels for Northern Ireland-related terrorism were also made available. The following table records changes to the threat levels from August 2006 – July 2019 before the 'New Format' was put into place:

Illustrations

Worked examples

Example 1 — a first encounter with UK Threat Levels

Start with the simplest possible case. Write down what UK Threat Levels claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to UK Threat Levels before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about UK Threat Levels ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of UK Threat Levels

In research: UK Threat Levels appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses UK Threat Levels in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: UK Threat Levels is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2006 introductions, Alert measurement systems, Counterterrorism in the United Kingdom, so understanding it makes those chapters shorter.
In everyday life: Look for UK Threat Levels outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study UK Threat Levels in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what UK Threat Levels means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain UK Threat Levels out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is UK Threat Levels in simple terms?

Why does UK Threat Levels matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study UK Threat Levels?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on UK Threat Levels.