I don't fear for my life particularly because of the case. But traveling to Libya is a hazardous venture. I certainly feel fairly isolated when I am in Libya. I think the venue will make no difference because the judges will be Scottish judges and the procedure will be Scottish procedure. It is not a jury trial.
Scottish law applies.
Proof beyond reasonable doubt. There's only one outcome, life in prison. If I know they were guilty, I'd still defend them. Knowing they were guilty would restrict the basis on which I could represent them. But I could still try to have the accused acquitted even if they had admitted their guilt to me.