(1)The Commission must—
(a)prepare a document setting out the frequency with which reviews under section 46 are to be conducted and the period to which they are to relate, and
(b)submit the document to the Secretary of State for approval.
(2)The document may make different provision for different cases.
(3)The Commission may revise the document from time to time with the approval of the Secretary of State.
(4)The Commission must publish the document as approved by the Secretary of State and as revised from time to time.