“We do not suggest that, in the foregoing, we have covered every possibility. By covering the major categories into which second appeals fall, we intend to indicate the principles for dealing with such appeals. It will be for the second Adjudicator to decide which of them is or are appropriate in any given case.”
"although the [Convention] rights may be engaged, legitimate immigration control will almost certainly mean that derogation from the rights will be proper and will not be disproportionate."