10Level of tolls: supplementary
(1)Subject to subsection (2) below—
(a)an order under paragraph (a) of subsection (2) of section 9 above may fix tolls at an amount less than that arrived at in accordance with that section, and
(b)where the amount of a toll which, in accordance with that section, falls to be fixed by an order under paragraph (b) of that subsection in respect of a category of vehicles exceeds that in force under the last order made under that subsection, the new order may fix an amount which does not implement the increase or implements it only in part.
(2)If it appears to the Secretary of State that at the time when an order under section 9(2) above is to come into force the power to levy tolls will be exercisable by the concessionaire, the order shall not fix tolls in accordance with subsection (1) above except with the concessionaire’s consent.
(3)Subject to subsection (4) below, the references in section 9(4) above to the retail prices index are references to the general index of retail prices (for all items) published by the Central Statistical Office of the Chancellor of the Exchequer.
(4)If that index is not published for any month those references are references to any other index, or substitute for an index, for that month which the Secretary of State may by order prescribe; and in determining which index or substitute to prescribe the Secretary of State shall have regard to any relevant provisions of the concession agreement.