“… though it is a pure finding of fact, it may be set aside on grounds which have been stated in various ways but are, I think, fairly summarised by saying that the court should take that course if it appears that the commissioners have acted without any evidence or upon a view of the facts which could not reasonably be entertained.”
“If the case contains anything ex facie which is bad law and which bears upon the determination, it is, obviously, erroneous in point of law. But, without any such misconception appearing ex facie, it may be that the facts found are such that no person acting judicially and properly instructed as to the relevant law could have come to the determination under appeal. In those circumstances, too, the court must intervene.”
‘The need for appellate caution in reversing the judge's evaluation of the facts is based upon much more solid grounds than professional courtesy. It is because Approved decision Okolo v HMRC20 November 2012 10:32 specific findings of fact, even by the most meticulous judge, are inherently an incomplete statement of the impression which was made upon him by the primary evidence. His expressed findings are always surrounded by a penumbra of imprecision as to emphasis, relative weight, minor qualification and nuance (as Renan said, la vérité est dans la nuance), of which time and language do not permit exact expression, but which may play an important part in the judge's overall evaluation. It would in my view be wrong to treat Benmax as authorising or requiring an appellate court to undertake a de novo evaluation of the facts in all cases in which no question of the credibility of witnesses is involved. When the application of a legal standard such negligence or obviousness involves no question of principle but is simply a matter of degree, an appellate court should be very cautious in differing from the judge's evaluation.’ [72] Similar expressions have been used in relation to similar issues. The principle has been applied in Pro Sieben Media v Carlton[1999] 1 WLR 605 at pp. 613- 614 (per Robert Walker LJ) in the context of a decision about ‘fair dealing’ with a copyright work; by Hoffmann LJ in Re Grayan Building Services[1995] Ch 241 at p.254 in the context of unfitness to be a company director; in Designer Guild v Russell Williams[2000] 1 WLR 2416 in the context of a substantial reproduction of a copyright work and, most recently in Buchanan v Alba Diagnostics[2004] UKHL 5 in the context of whether a particular invention was an ‘improvement’ over an earlier one. Doubtless there are other examples of the approach. [73] It is important here to appreciate the kind of issue to which the principle applies. It was expressed this way by Lord Hoffmann in Designer Guild: ‘Secondly, because the decision involves the application of a not altogether precise legal standard to a combination of features of varying importance, I think that this falls within the class of case in which an appellate court should not reverse a judge's decision unless he has erred in principle.’
“ … 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[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. … ”