Walter Kennedy:
There is no evidence whatsoever of airworthiness contributing to this crash
Which is exactly what both tuc and I have already said, though of course it might have done. But there is evidence that the aircraft was unairworthy, whereas there is no evidence that the pilots were trying to land at Mull, nor that they were Grossly Negligent. The former is your conjecture, the latter Wratten and Day's.