146Approval of major modifications by Judicial Commissioners
(1)In deciding whether to approve a decision to make a major modification of a bulk interception warrant, a Judicial Commissioner must review the Secretary of State’s conclusions as to whether the modification is necessary on any of the grounds on which the Secretary of State considers the warrant to be necessary.
(2)In doing so, the Judicial Commissioner must—
(a)apply the same principles as would be applied by a court on an application for judicial review, and
(b)consider the matter referred to in subsection (1) with a sufficient degree of care as to ensure that the Judicial Commissioner complies with the duties imposed by section 2 (general duties in relation to privacy).
(3)Where a Judicial Commissioner refuses to approve a decision to make a major modification under section 145, the Judicial Commissioner must give the Secretary of State written reasons for the refusal.
(4)Where a Judicial Commissioner, other than the Investigatory Powers Commissioner, refuses to approve a decision to make a major modification under section 145, the Secretary of State may ask the Investigatory Powers Commissioner to decide whether to approve the decision to make the modification.