4.—(1) The district council, in fixing the charge to be paid under paragraph 3 by the claimant of a shopping or luggage trolley, shall secure that the charges so payable by claimants shall be such as are sufficient, taking one financial year with another, to cover the cost of removing, storing and disposing of such trolleys under this Schedule.
(2) The council may agree with persons who own shopping or luggage trolleys and make them available for use in its district a scheme for the collection by them of trolleys they make available for use; and where such an agreement is in force with any person, no charge may be demanded under paragraph 3 by the council in respect of any trolley within the scheme in relation to which the provisions of the scheme are complied with.