What was the cause of the tumble, if not structural failure?
Sorry, discussion must wait until judicial proceedings are over.
What good is 'all but proved'? 'All but proved' means 'has not proved'.
The prosecution in a criminal case in England must show that what they say happened happened beyond reasonable doubt. The prosecution must prove; the defence must show only plausibility of an alternative. So "all but proved" is very helpful to a defence.
PBL