"The criteria to be met for a grant of discretionary leave are set out in the API on discretionary leave. The majority of grants of discretionary leave are likely to be made in protection cases. There are, however, a limited number of circumstances in which a non-protection case may qualify for a grant of discretionary leave, for example where removal would ... breachArticle 8 of the ECHR (right to private and family life) and most likely to arise in marriage ... cases."