It's sad to hear these tales of the AAIB. I speak regularly to a retired senior engineering inspector, who is at pains to point out that (similar to MoD BoIs/SIs) what the public and courts see is seldom what the inspectors write. In both cases there is often a 'political' overrule. For example, the Chinook ZA721 and ZD576 reports seem very odd, until one reads the originals and views images that were removed. It is entirely possible the original inspectors' reports (plural, and they don't necessarily see each other's) from Shoreham bring out many of the issues the final report omits. Perhaps the AAIB headshed, or their bosses, don't want it revisited; but the inspectors do.