I would also add that the clause states that a compensation event cannot be “notified” after the defects date. A notification of an event has to be separated from all other communications (13.7). Therefore, surely the question isn’t whether they can notify a CE up to that point? it is whether they can issue an “instruction” up to the defects date? As it is the instruction in 14.3 that changes the WI and not the notification in 60.1.
11.2 (2) defines Completion as when the Contractor has done all the work which the Works Information states he is to do by the Completion Date. Clause 30.2 states that the PM decides the date of Completion which he cannot do until the definition in 11.2 (2) has been satisfied.
There is no clause allowing the PM to retract a Completion certificate (unless an amendment is placed in Z clauses). So how can a PM instruct after Completion has been certified? as this would surely mean that not all of the works have been completed, and would this also mean that the certificate has not been issued in accordance with the contract? Which brings in 10.1 which states the PM must act as stated in the contract.