2.36 Authorities will wish to incentivise the SPV to progress the variation in a timely manner and to complete it. Change protocols should include reasonable timescales for each party to respond to the other. For all types of variations, the authority will want to ensure that the work is then carried out and/or the change implemented. For high value changes, if the SPV does not progress the work within the specified timescale, or if a contractor does not complete any outstanding snagging, the authority should be entitled to deduct a percentage of the capital charge for each additional business day in which the change remains unimplemented, up to a pre-agreed cap (this could be linked to the amount of any contractor mark-up which has been charged as staff time for implementing the change). When such deductions reach the level of the cap, the authority should be entitled to withdraw the change request and implement the change itself (after giving the contractor reasonable notice that it intends to do so). In this circumstance, the authority should be entitled to receive all the information relating to the variation (e.g. any designs) and the contractor should be responsible for any reasonable additional costs incurred by the authority up to a pre-agreed cap. Alternatively, authorities may wish to negotiate a standard rate of deduction for each type of change (the "Agreed Abatement").