# Prevention of Terrorism (Temporary Provisions) Act 1989 (repealed), Paragraph 4

Extent: E+W+S

(1) An authorisation must specify the period for which it will be in force.
(2) The period initially specified must not exceed 14 days.
(3) The specified period may be extended by one or more written variations made by an officer of at least the rank of superintendent.
(4) The overall period for which an authorisation is in force must not exceed 28 days.

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Source: https://www.legislation.gov.uk/ukpga/1989/4/schedule/6A/paragraph/4 (the official version)
Page: https://openlegislation.uk/prevention-of-terrorism-temporary-provisions-act-1989-repealed/schedule-6A/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.