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22(1)Every individual aged under 75 holding a pensionable office is to participate in the scheme as an “office-holder member” (unless the individual opts out under rule 24).
(2)An individual holds a pensionable office by being—
(a)the Presiding Officer,
(b)a deputy Presiding Officer,
(c)one of the Scottish Ministers, or
(d)a junior Scottish Minister.