3.—(1) In relation to appeals brought after the coming into operation of Article 77 and any time before the coming into operation of Article 13(8)(b), section 20 of the Administration Act (appeal to social security appeal tribunal) shall have effect as if after subsection (7) there were added the following subsection—
“(8) In deciding an appeal under this section, a social security appeal tribunal shall not take into account any circumstances not obtaining at the time when the decision appealed against was made.”.
(2) In relation to such appeals and any such time, section 31 of that Act (appeals following reviews) shall have effect as if after subsection (6) there were added the following subsection—
“(7) The tribunal shall not take into account any circumstances not obtaining at the time when the decision appealed against was made.”.