25An individual who has opted out of participating in the scheme may, if subsequently elected as an MSP, opt back into the scheme as an MSP member with effect from the election date by—
(a)giving notice to the Fund trustees within 3 months of being elected, and
(b)paying to the Fund trustees by the due date the amount which they certify as the amount of scheme member contributions which would have been made from the individual’s MSP salary payments between the election date and the next day on which a scheme member contribution is to be made.
“due date” means the 28th day after the Fund trustees give their certification to the MSP (or any later day as the Fund trustees may specify).