3 Annual Payment
The Annual Payment for a Contract Year shall be calculated on the Service Transfer Date and on each anniversary thereafter in accordance with the following formula:

where:
ASPn | means the Annual Payment for the relevant Contract Year n |
ASPo | means the Annual Payment at the Base Date |
RPIn10 | means the Retail prices Index for the relevant month in Contract Year n |
RPIo | means the Retail Price Index for the month in which the Base Date falls. |
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10 Consider appropriate indexation for project.