In developing a High Value Change Stage 2 Submission Project Co must continue to liaise with the Authority and relevant end users (being such persons or organisations as the Authority in consultation with Project Co considers appropriate). The Authority must provide Project Co with such information as to its requirements as is reasonably necessary to enable Project Co to submit a full and complete High Value Change Stage 2 Submission and any such other information as Project Co may reasonably require and must assist Project Co in the review of any draft designs in relation to the Stage 1 Approved Project and in the development of other aspects of the High Value Change Stage 2 Submission (but not where this would involve the Authority incurring additional material expense). Any and all information and other input or feedback provided by the Authority to Project Co will be without warranty and will be provided without prejudice to the Authority's rights under this Section 4 (High Value Changes).