“53. In so far as an expert’s report does no more than opine on facts which require no expertise of his to evaluate, it is inadmissible and should be given no weight on that account. But, as the judge also observed, there is nothing to be gained, except in very clear cases, from excluding or excising opinions in this category. I agree with what he said in para 117 of his judgment: “Such an exercise is unnecessary and disproportionate especially when such statements are intertwined with others which reflect genuine expertise and there is no clear dividing line between them. In such circumstances, the proper course is for the whole document to be before the court and for the judge at trial to take account of the report only to the extent that it reflects expertise and to disregard it in so far as it does not. As Thomas LJ trenchantly observed in Secretary of State for Business Enterprise and Regulatory Reform v Aaron [2009] Bus LR 809 , para 39: ‘It is my experience that many experts report views on matters on which it is for the court to make its decision and not for an expert to express a view. No modern or sensible management of a case requires putting the parties to the expense of excision; a judge simply ignores that which is inadmissible’. 54. The judge concluded that the whole of the report was admissible, it being a matter for the trial judge to make use of the report as he or she thought fit. Even if he had concluded that it contained some inadmissible material he would not have thought it sensible to engage in an editing exercise. The trial judge should see the whole report and leave out of account any part of it that was inadmissible. 55. Subject to the second and third grounds of appeal, I agree with this conclusion. It is not apparent to me that any part of the report should be regarded as simply expressing an opinion on matters of fact (as opposed to recording evidence) in relation to which the expertise of the AAIB has no relevance. But even if any part of the report was (or proves on close analysis hereafter) to have that character, the correct approach is as outlined by the judge.”
“The ultimate message from that decision is that it is much preferable for the court, rather than picking through expert reports, seeking to excise individual sentences and engaging in an editing exercise, to allow the trial judge to consider the report in its entirety, assuming that it is genuine expert evidence, and to attach such weight as it sees fit at the trial to those passages in the report.”
“Hoyle is an important commonsense judgment, sweeping away historic and unnecessary restrictions on admissibility and treating all matters as going to weight and for the trial judge to evaluate.”
"…Even if he had concluded that it contained some inadmissible material he would not have thought it sensible to engage in an editing exercise. The trial judge should see the whole report and leave out of account any part of it that was inadmissible. "…even if any part of the report was (or proves on close analysis hereafter) to [be simply expressing an opinion on matters of fact], the correct approach is as outlined by the judge."
“…it might have been preferable if he had said that his conclusions were based on whether a pianist or guitarist composed the music. However, I do not think that it is appropriate or necessary for me at this stage, or at all, to exclude this evidence. It is Mr Protheroe’s opinion, no doubt sincerely held, and it seems to me appropriate that he should express himself as he wishes to do so. What weight is to be attached to it, as I have said, is a matter for the trial..”