(1) If a civil defence emergency management group plan has been operative for 5 years or more and it is more than 5 years since the plan has been reviewed under this section, the Civil Defence Emergency Management Group concerned must review the plan.
(2) A Group may at any time review any civil defence emergency management group plan made by it.
(3) Following a review, the Group may amend or revoke and replace the plan or leave the plan unchanged.
(4) A review under this section is commenced by a proposal notified in accordance with section 52, and sections 49, 51, and 55 apply to that review with any necessary modifications.