6.1 No approval or comment or any failure to give or make an approval or comment under this Schedule Part 8 shall constitute a Change save to the extent provided in this Schedule Part 8 (Review Procedure).
6.2 If, having received comments from the Authority's Representative, Sub-hubco considers that compliance with those comments would amount to a Change, Sub-hubco shall, before complying with the comments, notify the Authority of the same and, if it is agreed by the parties or determined pursuant to Schedule Part 20 (Dispute Resolution Procedure) that a Change would arise if the comments were complied with, the Authority may, if it wishes, implement the Change and it shall be dealt with in accordance with Schedule Part 16 (Change Protocol). Any failure by Sub-hubco to notify the Authority that it considers compliance with any comments of the Authority's Representative would amount to a Change shall constitute an irrevocable acceptance by Sub-hubco that any compliance with the Authority's comments shall be without cost to the Authority and without any extension of time.
6.3 No alteration or modification to the design, quality and quantity of the Works arising from the development of detailed design or from the co-ordination of the design shall be construed or regarded as a Change.