3.1 For the purposes of paragraph 2.2.1 (Annual Service Payment) of this Section B, the adjustment to be made to ASPo shall be the addition of a figure in pounds sterling (whether positive or negative) calculated in accordance with the formula:

where:
3.1.1 A is the adjustment to be made to ASPo;
3.1.2 NAP is the aggregate of the new annual prices for the Market Tested Services arising from the Market Testing;
3.1.3 OPVT is the aggregate of the original annual prices for the Market Tested Services, as set out in the second column of Appendix B to this Part 18 of the Schedule (Payment Mechanism);
3.1.4 RPIn is the value of the RPI published or determined with respect to the month of February in the Contract Year in which the Market Testing Date falls; and
3.1.5 RPIo is the value of the RPI published or determined with respect to the Indexation Base Month.