NB: The issue relates to the use of the AAIB report itself (the document) as evidence - not to witnesses (expert or other) giving evidence in court.
Thank you Flying Lawyer, that's interesting and it seems reasonable and fair given the right to cross examine witnesses. However, if I understand you correctly, there is nothing to preclude the prosecution from using an AAIB report as a road map to round up the appropriate witnesses and experts, and formulate the questions to ask.