83.Section 9 provides for the issue, duration and renewal of warrants.
84.Subsection (1)(a) states that a warrant ceases to have effect at the end of the relevant period unless renewed under the power in subsection (1)(b). A renewal instrument must be issued under the hand of the Secretary of State unless the warrant was issued under Section 7(2)(b), in which case the renewal instrument may be issued by a senior official. Section 7(2)(b) applies to cases in which the warrant is issued to comply with a request for mutual assistance where the subject of interception or the relevant premises and the competent authority making the request are outside the United Kingdom.
Commentary on Sections “External communications” is defined in Section 20. Section 9: Duration, cancellation and renewal of warrants.