9Revision of decisions
(1)Subject to section 36(3) below, any decision of the Secretary of State under section 8 above or section 10 below may be revised by the Secretary of State—
(a)either within the prescribed period or in prescribed cases or circumstances; and
(b)either on an application made for the purpose or on his own initiative;
and regulations may prescribe the procedure by which a decision of the Secretary of State may be so revised.
(2)In making a decision under subsection (1) above, the Secretary of State need not consider any issue that is not raised by the application or, as the case may be, did not cause him to act on his own initiative.
(3)Subject to subsections (4) and (5) and section 27 below, a revision under this section shall take effect as from the date on which the original decision took (or was to take) effect.
(4)Regulations may provide that, in prescribed cases or circumstances, a revision under this section shall take effect as from such other date as may be prescribed.
(5)Where a decision is revised under this section, for the purpose of any rule as to the time allowed for bringing an appeal, the decision shall be regarded as made on the date on which it is so revised.
(6)Except in prescribed circumstances, an appeal against a decision of the Secretary of State shall lapse if the decision is revised under this section before the appeal is determined.