It comes down to under which clause the quotation was requested under. If it was under clause 61.2 (or 65.1 for NEC4) then this is just for a proposed quotation and you should not proceed in the meantime until there is a response and a subsequent instruction if the Project Manager wishes to proceed.
If there has been a clear instruction to install the kerbs, and the quotation requested under clause 61.1 then the Contractor should be proceeding with the installation without waiting for the quote to be agreed, and run the risk of delay damages if they have not proceeded and end up exceeding the Completion Date.
It should have been clear when the quote was instructed whether in the meantime the Contractor should have proceeded, and if the Contractor was in any doubt they should have clarified.
If the Parties had been using an online administration tool such as FastDraft for the flow of NEC communications then this could not have happened, as the form would have forced the PM to make it clear whether the quote was being requested under 61.1 or 61.2 before it was issued to the Contractor
If there has been a clear instruction to install the kerbs, and the quotation requested under clause 61.1 then the Contractor should be proceeding with the installation without waiting for the quote to be agreed, and run the risk of delay damages if they have not proceeded and end up exceeding the Completion Date.
It should have been clear when the quote was instructed whether in the meantime the Contractor should have proceeded, and if the Contractor was in any doubt they should have clarified.
If the Parties had been using an online administration tool such as FastDraft for the flow of NEC communications then this could not have happened, as the form would have forced the PM to make it clear whether the quote was being requested under 61.1 or 61.2 before it was issued to the Contractor