5. As if in regulation 12 (circumstances in which determination need not be revised) for the words—
(a)“or revision of determination” there were substituted the words “, revision or supersession”; and
(b)“for reviewing and revising the determination under which payment was made” there were substituted the words “for the decision pursuant to which the payment was made to be revised under section 9 of the Social Security Act 1998 or superseded under section 10 of that Act”.