UK Threat Levels - Threat Levels

Threat Levels

Threat level Response
Critical An attack is expected imminently.
EXCEPTIONAL
Maximum protective security measures to meet specific threats and to minimise vulnerability and risk. Critical may also be used if a nuclear attack is expected.
Severe An attack is highly likely.
HEIGHTENED
Additional and sustainable protective security measures reflecting the broad nature the threat combined with specific business and geographical vulnerabilities and judgements on acceptable risk.
Substantial An attack is a strong possibility.
Moderate An attack is possible, but not likely.
NORMAL
Routine protective security measures appropriate to the business concerned.
Low An attack is unlikely.

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