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In page Human rights in the United Kingdom:

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Part 4 did not create new detention powers – under the 1971 Immigration Act, the Home Secretary has the power to detain a foreign national pending deportation. Instead, Part 4 removed a limitation on detention powers imposed by the requirements of Article 5(1)(f) of the European Convention on Human Rights (which provided, among other things, that someone could only be detained for a short period prior to deportation). This was achieved by the British government derogating from the ECHR on the basis that the threat to the UK amounted to a 'public emergency threatening the life of the nation' within the meaning of Article 15.[citation needed]