The UK Threat Level is determined by the Joint Terrorism Analysis Committee (JTAC). This is an independent body, which sets the level based on security intelligence. There are five levels of threat (the highest being CRITICAL). Read more about the UK threat level. When the UK threat level moves to CRITICAL the NHS takes steps to prepare itself to respond to any imminent attack.
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If you are a member of the public looking for information and advice about coronavirus (COVID-19), including information about the COVID-19 vaccine, go to the NHS website. You can also find guidance and support on the GOV.UK website.