2.3  Changes to Project Documents

The Service Provider shall perform its obligations under and observe all the terms of the Project Documents to which it is a party and shall not:

(a)  terminate or agree to the termination of all or part of any Project Document;

(b)  make or agree to any material variation of any Project Document;

(c)  in any material respect depart from its obligations (or waive or allow to lapse any rights it may have in a material respect) or procure that any counterparty to a Project Document in any material respect departs from its obligations (or waives or allows to lapse any rights they may have in a material respect) under any Project Document;

(d)  enter into (or permit the entry into by any other person of) any agreement replacing all or part of (or otherwise materially or adversely affecting the interpretation or application of) any Project Document;

unless the proposed course of action (and any relevant documentation) has been submitted to the Authority for review pursuant to the Review Procedure within twenty (20) Business Days (or such earlier period as may be agreed by the parties) of receipt by the Authority of such submission and there has been no objection in accordance with the Review Procedure and provided, in the circumstances specified in clause 2.3(a) that the Service Provider has complied with the provisions of clause 70 (Assignment and Sub Contracting).