The unfortunate pilot and his family would be well advised to contact a firm of solicitors who are experts in this particular field of the law and in the meantime to say absolutely nothing whatsoever to anyone regardless of whom they are.
To me, such "advice" is equally offensive as the speculation. Maybe worse. It certainly paints the pilot as guilty of something and as having something to hide. I don't know how it works in the UK, but in the US all testimony provided in an accident investigation canNOT be used in a court of law precisely to ensure that all the facts are known so such an accident can be prevented. The lawyers have to use other sources of evidence.