“30. … This is an expert tribunal charged with administering a complex area of law in challenging circumstances. To paraphrase a view I have expressed about such expert tribunals in another context, the ordinary courts should approach appeals from them with an appropriate degree of caution; it is probable that in understanding and applying the law in their specialised field the tribunal will have got it right: see Cooke v Secretary of State for Social Security[2001] EWCA Civ 734 ,[2002] 3 All ER 279 , para 16. They and they alone are the judges of the facts. It is not enough that their decision on those facts may seem harsh to people who have not heard and read the evidence and arguments which they have heard and read. Their decisions should be respected unless it is quite clear that they have misdirected themselves in law. Appellate courts should not rush to find such misdirections simply because they might have reached a different conclusion on the facts or expressed themselves differently. I cannot believe that this eminent Tribunal had indeed confused the three tests or neglected to apply the correct relocation test. The structure of their determination can be explained by the fact that this was a “country guidance” case: but that makes it all the more important that the proper approach to the internal relocation alternative, as explained by the House in this case, is followed in future.”
“Each of these grounds for detecting an error of law contain the word ‘material’ (or ‘immaterial’). Errors of law of which it can be said that they would have made no difference to the outcome do not matter….”
“… the House of Lords in AH (Sudan)[2007] UKHL 49 has stressed that appellate courts should not pick over AIT decisions in a microscopic search for error, and should be prepared to give immigration judges credit for knowing their job even if their written determinations are imperfectly expressed. This is no more than a paraphrase of a decision which, I respectfully think, is intended to lay down no new principle of law (cf, for example, Retarded Children's Aid Society v Day[1978] IRLR 128 , §19, per Lord Russell) but to ensure that appellate practice is realistic and not zealous to find fault. Their Lordships do not say, and cannot be taken as meaning, that the standards of decision-making or the principles of judicial scrutiny which govern immigration and asylum adjudication differ from those governing other judicial tribunals, especially when for some asylum-seekers adjudication may literally be a matter of life and death. There is no principle that the worse the apparent error is, the less ready an appellate court should be to find that it has occurred.”
“As I see it, the reason why the courts do not interfere with the Commissioners' findings or determinations when they really do involve nothing but questions of fact is not any supposed advantage in the Commissioners of greater experience in the matters of business or any other matters. The reason is simply that by the system that has been set up the Commissioners are the first tribunal to try an appeal, and in the interest of the efficient administration of justice their decisions can only be upset on appeal if they have been positively wrong in law. The Court is not a second opinion where there is a reasonable ground for the first. But there is no reason to make a mystery about the subjects that Commissioners deal with or to invite the courts to impose any exceptional restraint on themselves because they are dealing with cases that arise out of facts found by the Commissioners. Their duty is no more than to examine those facts with a decent respect for the tribunal appealed from and if they think that the only reasonable conclusion on the facts found is inconsistent with the determination come to, to say so without more ado.”