Or that some email from an unknown "third party" (what is it now, five levels removed?) has any credibility whatsoever?
Rest assured, the CAA Enforcement Branch will have access to the relevant RT and radar recordings to support any action they need to take. Let's start with 'infringement' of Edinburgh airspace (the pilot did not have a clearance to enter it, he only had a clearance in the TMA above) and a failure to comply with ATC instructions (non compliance with level instructions which could stretch to 'endangerment') and see where we go from there.
The airmanship and accident pieces of this incident should be kept separate.
On airmanship grounds alone, it seems that our hero should not be let loose on other airspace users until he has been educated to an appropriate standard which allows him to use UK airspace without endangering other fliers and the broader public.
On the accident, he walked away so that is a plus point. How he ended up having to land in the tree in the first place is the important question for the AAIB to answer.