That last paragraph has made me wonder for long enough.
Such, whilst not necessarily changing any of the feelings/gut instincts the relatives had regarding Jeremy, NOR lessening the professional rivalry/personal dislike which may have existed between the two Jones', it goes a long way to negate framing of the industrial nature. It's unnecessary for either the defence or prosecution to have belief in the defendant's innocence/guilt, their job is only to prosecute or defend. I think it's entirely possible, unless there's personal animosity, certain information sometimes gets shared.