Answered: NEC ECC : What can be included within quotation?

Basically any extra cost that the Contractor will incur as a result of this event that they would not otherwise have incurred is what they can claim for.

If the existing management team who were going to be there anyway can also do this work then they can't claim extra. If they have to bring in additional resources over and above what they originally priced for to manage the procurement and management of the additional works then yes they can.