Jayand
My understanding is that the AAIB do not attribute blame and are very careful not to do so. They report the circumstances that led to the accident and may make recommendations but they are not, repeat not, regulators. IMHO that is why they are trusted by the professional aviation community.
The role of the CAA and the police is quite different and for good reason. What has caused disquiet is the idea that evidence gathered by the AAIB for its technical investigation may be used in a prosecution. This has been discussed elsewhere on pprune at great detail if you are genuinely interested. Sorry for the thread drift.
Back on the thread. It's welcome news that AH is recovering. I recently flew with an ex colleague of his and he spoke very highly of him. Not forgetting the families of those also affected by this awful tragedy one of whom is a friend of a friend.
BBK