Pitsextra
You have to read paragraph one and two together, basicly im saying that if you don't get a report right first time the ambulance chasing lawyers will rip the report apart resulting in the AAIB loosing credibility, so the answer to this is to take time to make sure the report is watertight.
The other issue is that once the report is written all the interested party's get to read the draft and comment, this may result in some parts being rewritten to correct of clarify some of the facts.
Unfortunatly in these times of 24 hour rolling news journalists with little understanding report things as if they were fact and the public digest this as fact and a matter of record ( I have also herd a radio journalist mis correct an AAIB report because they did not understand it !) so the AAIB takes time to ensure that what is written is as near the truth as is humanly posable.
It is much better for those affected by the situation to wait for a definitive report than have a report that has not fully covered all the issues and then have the pain of a controversy where the Journalists and lawyers can shout "cover up " just to line their own pockets.