15.2 Neither the Authority nor Sub-hubco shall without the other's prior written approval (not to be unreasonably withheld or delayed):
15.2.1 terminate, repudiate or discharge the Independent Tester Contract or treat the same as having been terminated, repudiated or otherwise discharged;
15.2.2 waive, settle, compromise or otherwise prejudice any rights or claims which the other may from time to time have against the Independent Tester; or
15.2.3 vary the terms of the Independent Tester Contract or the service performed or to be performed by the Independent Tester.
15.3 The parties shall comply with and fulfil their respective duties and obligations arising under or in connection with the Independent Tester Contract.