(1) Where:
(a) a warrant (other than a warrant issued under section 48) is issued to an agency; and
(b) it is proposed, under the warrant, to intercept communications to or from a telecommunications service while they are passing over a telecommunications system operated by a carrier;
a certifying officer of the agency shall cause;
(c) an authorised representative of that carrier to be informed immediately of the issue of the warrant; and
(d) a copy of the warrant, certified in writing by a certifying officer of the agency to be a true copy of the warrant, to be given as soon as practicable to that authorised representative.
(3) Where:
(a) an authorised representative of a carrier has been informed, under subsection (1), of the issue of a warrant; and
(b) the warrant is revoked;
a certifying officer of the agency to which the warrant was issued shall cause:
(c) that authorised representative to be informed immediately of the revocation; and
(d) a copy of the instrument of revocation, certified in writing by a certifying officer of the agency to be a true copy of the instrument, to be given as soon as practicable to that authorised representative.
(4) Where:
(a) an authorised representative of a carrier has been informed, under subsection (1), of the issue of a named person warrant; and
(aa) the warrant is not a warrant that authorises interception of communications made by means of a telecommunications device or telecommunications devices identified in the warrant; and
(b) it is proposed, under the warrant, to intercept communications made to or from a telecommunications service operated by a carrier; and
(c) the service was not identified in the warrant;
a certifying officer of the agency must cause that authorised representative to be given, as soon as practicable, a description in writing of the service sufficient to identify it.
(4A) Where:
(a) an authorised representative of a carrier has been informed, under subsection (1), of the issue of a named person warrant; and
(b) the warrant is a warrant that authorises interception of communications made by means of a telecommunications device or telecommunications devices identified in the warrant; and
(c) it is proposed, under the warrant, to intercept, by means of a telecommunications device, communications made to or from a telecommunications service operated by the carrier; and
(d) the device was not identified in the warrant;
a certifying officer of the agency must cause that authorised representative to be given, as soon as practicable, a description in writing of the device sufficient to identify it.
(5) Where:
(a) an authorised representative of a carrier has been informed, under subsection (1) of the issue of a named person warrant; and
(b) a certifying officer of that agency is satisfied that the interception of communications made to or from a particular service, or by means of a particular device or particular devices, is no longer required;
the certifying officer must cause:
(c) that authorised representative to be informed immediately of the fact; and
(d) confirmation in writing of the fact to be given as soon as practicable to that authorised representative.