In developing a High Value Change Stage 2 Submission Sub-hubco must continue to liaise with the Authority and relevant end users (being such persons or organisations as the Authority in consultation with Sub-hubco considers appropriate). The Authority must provide Sub-hubco with such information as to its requirements as is reasonably necessary to enable Sub-hubco to submit a full and complete High Value Change Stage 2 Submission and any such other information as Sub-hubco may reasonably require and must assist Sub-hubco 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 Sub-hubco will be without warranty and will be provided without prejudice to the Authority's rights under this Section 4 (High Value Changes).