9. In relation to appeals brought after the coming into operation of Article 77 and any time before the coming into operation of Article 42, Article 22 of the Child Support Order (appeals) shall have effect as if after paragraph (4) there were added the following paragraph—N.I.
“(5) In deciding an appeal under this Article, the tribunal shall not take into account any circumstances not obtaining at the time when the decision appealed against was made.” .