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"Part 4 Perversity, the failure to give reasons, and proportionality It may be helpful to comment quite briefly on three matters first of all. It is well known that "perversity" represents a very high hurdle. In Miftari v SSHD[2005] EWCA Civ 481 , the whole court agreed that the word meant what it said: it was a demanding concept. The majority of the court (Keene and Maurice Kay LJJ) said that it embraced decisions that were irrational or unreasonable in the Wednesbury sense (even if there was no wilful or conscious departure from the rational), but it also included a finding of fact that was wholly unsupported by the evidence, provided always that this was a finding as to a material matter. We mention this because far too often practitioners use the word "irrational" or "perverse" when these epithets are completely inappropriate. If there is no chance that an appellate tribunal will categorise the matter of which they make complaint as irrational or perverse, they are simply wasting time – and, all too often, the taxpayer's resources – by suggesting that it was. The second preliminary matter is this. Adjudicators were under an obligation to give reasons for their decisions (see reg 53 of theImmigration and Asylum Appeals (Procedure) Regulations 2003 ), so that a breach of that obligation may amount to an error of law. However, unjustified complaints by practitioners that are based on an alleged failure to give reasons, or adequate reasons, are seen far too often. The leading decisions of this court on this topic are now Eagil Trust Co Ltd v Pigott-Brown[1985] 3 All ER 119 and English v Emery Reimbold & Strick Ltd[2002] EWCA Civ 605 ,[2002] 1 WLR 2409 . We will adapt what was said in those two cases for the purposes of illustrating the relationship between an adjudicator and the IAT. In the former Griffiths LJ said at p 122: "[An adjudicator] should give his reasons in sufficient detail to show the [IAT] the principles on which he has acted and the reasons that have led him to his decision. They need not be elaborate. I cannot stress too strongly that there is no duty on [an adjudicator], in giving his reasons, to deal with every argument presented by [an advocate] in support of his case. It is sufficient if what he says shows the parties and, if need be, the [IAT], the basis on which he has acted, and if it be that the [adjudicator] has not dealt with some particular argument but it can be seen that there are grounds on which he would have been entitled to reject it, [the IAT] should assume that he acted on those grounds unless the appellant can point to convincing reasons leading to a contrary conclusion."
"[I]f the appellate process is to work satisfactorily, the judgment must enable the [IAT] to understand why the [adjudicator] reached his decision. This does not mean that every factor which weighed with the [adjudicator] in his appraisal of the evidence has to be identified and explained. But the issues the resolution of which were vital to the [adjudicator]'s conclusion should be identified and the manner in which he resolved them explained. It is not possible to provide a template for this process. It need not involve a lengthy judgment. It does require the [adjudicator] to identify and record those matters which were critical to his decision. If the critical issue was one of fact, it may be enough to say that one witness was preferred to another because the one manifestly had a clearer recollection of the material facts or the other gave answers which demonstrated that his recollection could not be relied upon."