«In an Article 8 case where this question is reached, the ultimate question for
the appellate immigration authority is whether the refusal of leave to enter or remain, in circumstances where the life of the family can not reasonably be expected to be enjoyed elsewhere, taking full account of all considerations weighing in favour of the refusal, prejudices the family life of the applicant in a manner sufficiently serious to amount to a breach of the fundamental right protected by Article 8.