4.1 Sub-hubco shall perform its obligations under, and observe all of the provisions of, the Project Documents to which it is a party and shall not:
4.1.1 terminate or agree to the termination of all or part of any Ancillary Document;
4.1.2 make or agree to any material variation of any Ancillary Document;
4.1.3 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 others in any material respect depart from their obligations (or waive or allow to lapse any rights they may have in a material respect), under any Ancillary Document; or
4.1.4 enter into (or permit the entry into by any other person of) any agreement replacing all or part of (or otherwise materially and adversely affecting the interpretation of) any Ancillary Document,
unless the proposed course of action (and any relevant documentation) has been submitted to the Authority's Representative for review under Schedule Part 8 (Review Procedure) and either:
(a) there has been no objection in accordance with paragraph 3 of Schedule Part 8 (Review Procedure) within twenty (20) Business Days of receipt by the Authority's Representative of the submission of the proposed course of action (and any relevant documentation), or such shorter period as may be agreed by the parties; or
(b) Sub-hubco is acting in accordance with the comments of the Authority as provided in paragraph 4.2 of Schedule Part 8 (Review Procedure);
and, in the circumstances specified in Clause 4.1.1, Sub-hubco has complied with Clause 57 (Assignation and Sub-contracting).