3. The circumstances are that–
(a)the appeal will be an appeal under section 20(1)(a) or (b) of the Act;
(b)the decision by the Secretary of State against which the appeal is brought was made on the basis that a particular person (whether the applicant or some other person) either was, or was not, a parent of the qualifying child in question (“a parentage determination”); and
(c)the ground of appeal will be that, the parentage determination being unfounded in fact, the decision should not have been made on that basis.