“Where, as in this case, complaint is made of the reasoning of an adjudicator in respect of a question of fact (that is to say credibility), particular care is necessary to ensure that the criticism is as to the fundamental approach of the adjudicator, and does not merely reflect a feeling on the part of the appellate tribunal that it might itself have taken a different view of the matter from that that appealed to the adjudicator.”
“...the appellate court must bear in mind the advantage which the first instance judge had in seeing the parties and the other witnesses. This is well understood on questions of credibility and findings of primary fact. But it goes further than that. It applies also to the judge's evaluation of those facts. ...”
“The need for appellate caution in reversing the trial judge’s evaluation of the facts is based upon much more solid grounds than professional courtesy. It is because 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 … of which time and language do not permit exact expression, but which may play an important part in the judge’s overall evaluation.”