Agreements inconsistent with the provisions of this Order
56.—(1) An agreement which purports to make provisions regulating the execution of street works is of no effect to the extent that it is inconsistent with the provisions of this Order.
(2) This does not affect an agreement for the waiver or variation of a right conferred on a relevant authority by any of the provisions of this Order which is made after the right has accrued and is not inconsistent with the future operation of those provisions.