10(1)A supplementary payment shall be payable if the area of the authority or a part of it lies within the metropolitan district, and the amount of the payment shall be a prescribed percentage of the basic payment, being such percentage as appears to the Minister appropriate having regard to the higher level of prices, costs and remuneration in and around the area.
(2)Different percentages may be prescribed for the purposes of this paragraph in relation to authorities whose areas lie wholly within the metropolitan district and authorities whose areas lie partly within the district and partly outside it.
(3)In this paragraph " metropolitan district " means Greater London together with the remainder of the Metropolitan Police District.