4For the purposes of the Immigration Act 1971 as applied by paragraphs 1 to 3 above, an appeal under section 2 above shall be treated as pending during the period beginning when notice of appeal is duly given and ending when the appeal is finally determined or withdrawn; and an appeal shall not be treated as finally determined so long as a further appeal can be brought by virtue of section 7 above, nor, if such an appeal is duly brought, until it is determined or withdrawn.