Answered: NEC ECC: Equipment costs for delay

The time effects are assessed against clause 63.3 i.e. the Accepted Programme. This provides an incentive for the Contractor to keep it up to date both to reflect progress etc. and to keep the Employer / PM up to speed about their intentions.

By implication, the change in Defined Costs is therefore calculated in part against the effect on the Accepted Programme of the compensation event.

So, without knowing further details, it comes down to what was in the Accepted Programme at the time.