20.—(1) At any time prior to the end of the maximum fares requirement period a review of any requirements as to maximum fares may be requested by—
(a)three or more relevant participating operators; or
(b)at least 50% of relevant participating operators,
whichever is the lesser.
(2) Where a review is requested in accordance with paragraph (1) the operator or operators making the request must—
(a)specify to which requirements as to maximum fares the request relates;
(b)submit representations and evidence in support of the request; and
(c)propose revised requirements as to the maximum fares that may be charged for particular journeys, or for journeys of particular descriptions.
(3) Except where the request for a review is an excepted request the lead authority must, within a period of 28 days beginning with the day on which a request submitted in accordance with paragraph (1) is received, issue a written review notice to relevant participating operators.