1.6.1 Although Authority consent for the Refinancing must be given, and the method and basis for the calculations of the payment of the Authority's share of the Refinancing Gain must be agreed, before the Refinancing takes place, the final calculation cannot be completed until after the Refinancing because the exact amount of the Refinancing Gain will depend on factors such as the final costs of the Refinancing and the interest rates fixed on the Refinancing date.