11(1)Where in respect of any employment a recognition certificate has been issued, no alteration of the rules of the relevant recognised scheme shall be made so as to affect any of the matters dealt with in sections 51 to 62 of this Act without the Board's consent; and any such alteration made without that consent shall be void:
Provided that a consent given by the Board for the purpose of this paragraph shall, if and to the extent that the Board so direct, operate so as to validate with retrospective effect any operation of the rules which would otherwise be void under this paragraph.
(2)This paragraph shall continue in force in relation to a scheme after it has ceased to be recognised so long as any person qualifies (immediately or prospectively) for any of the minimum benefits of the scheme within the meaning of section 62 of this Act.