10. Where, by virtue of the Taxes Act or any later enactment, schemes which were approved schemes before a certain date have effect as if their rules restricted the total benefits payable under them, the rules of the Scheme have effect subject to those restrictions, notwithstanding any amendments of them by virtue of these or any earlier regulations after the date of that Act or enactment, and in so far as those restrictions would permit those total benefits to be greater than is otherwise permitted under the Scheme, those restrictions shall prevail.