NEC3 ECC: Does the Contractor have to use the Bill of Quantities under Option B when compiling a quotation, if applicable?

If the Contractor is asked for a quotation for an additional element of work which is the same as the priced bill of quantities, do they have to use billed rates?

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No. For compensation events, only by agreement (both Parties agreeing) do you use B of Q rates under option B/D and activity schedule rates under options A/C. The default position is that you do not use rates and you build the quotation up from first principles in terms of Defined Cost (clause 63.13 in option B).