2.11.1 Where, in the opinion of the Contractor, any instruction, or other item, which, in the opinion of the Contractor, constitutes an instruction issued by the Architect will require an adjustment to the Contract Sum and/or delay the Completion Date the Contractor shall not execute such instruction (subject to clause 2.11.4) unless he shall have first submitted to the Architect, in writing, within 10 working days (or within such other period as maybe agreed between the Contractor and the Architect) of receipt of the instruction details (...) If the Contractor fails to comply with any one or more of the provisions of clause 2.11.1, where the Architect has not dispensed with such compliance under clause 2.11.4, the Contractor shall not be entitled to any extension of time under clause 2.19.

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