Answered: NEC ECC: Can the Contractor change the method that the pricing was based upon (and shown in the Accepted Programme)

Yes, if the activity schedule no longer reflects the programme then under 54.1 the Contractor can submit a revised activity schedule for acceptance. As long as the costs on that revised activity schedule are in line with the revised programme, add up to the correct number and are sensibly distributed then there should be no reason not to accept that activity schedule which will then become THE activity schedule which they will then be paid against.