You need to apply the wording of the contract to get the correct answer here. There is no such thing as "incidental" and "non-incidental". You price the works at tender stage, and then anything that was not in the scope or anything that happens is not your risk is then able to be claimed as a compensation event. You then need to follow the rules of the contract as to how to assess a compensation event - in terms of quotation and assessment.
Very important as well you keep an up to date Accepted Programme during the life of the project so you can assess/demonstrate entitlement for each and every event.
Very important as well you keep an up to date Accepted Programme during the life of the project so you can assess/demonstrate entitlement for each and every event.