Paragraph 23 Determination of contributions for given level of increased pension
The Secretary of State shall from time to time determine the amount of monthly payments of contributions or lump sum payment of contributions required for any given amount of increased retirement pension and different amounts may be specified—
(a)
in relation to different classes or descriptions of persons, and
(b)
depending on whether the election is one specified in paragraph 5(a) or 12(a) or in paragraph 5(b) or 12(b),
and, where additional contributions are paid in monthly payments, different amounts may be determined depending on the length of the contribution period.