The Defects Liability Certificate for the Works shall, within 28 days after the expiration of the Defects Liability Period, be issued by the Engineer, or, if different defects liability periods become applicable to different Section or parts of the Permanent Works, the expiration of the latest such period, or if, pursuant to Clause 82, any works instructed are completed to the satisfaction of the Engineer, the Defects Liability Certificate therefor shall be issued by the Engineer as soon as possible.