(1) A deciding officer may, at any time and from time to time, revise any decision of a deciding officer, if it appears to him that the decision was erroneous in the light of new evidence or of new facts which have been brought to his notice since the date on which it was given or by reason of some mistake having been made with respect to the law or the facts, or if it appears to him in a case where a weekly payment has been payable that there has been any relevant change of circumstances since the decision was given, and the provisions of this Act as to appeals shall apply to such revised decision in the same manner as they apply to an original decision.

(2) Subsection (1) shall not apply to a decision relating to a matter which is on appeal or reference under section 39 unless the revised decision would be in favour of a claimant for a weekly payment.

(3) A revised decision given by a deciding officer shall take effect as follows: -