Sharingan, at the time of the Bamber trial, it was covered extensively, it was the talk of the Bar and I knew both John Marriage , the QC prosecuting, and Ed Lawson, one of the defence counsel well. I forget who was leading counsel for the defence. The defence looked runnable provided you could take the jury into technical distractions about the forensic evidence, so they didn't "keep their eye on the ball" and see the wider picture for what it was.
As to evidence, remember that Bamber blamed his sister. That meant that she had shot her own children, with no motive, as well as her parents but had failed to kill the allegedly absent Bamber. If Bamber did it with the motive of inheriting, he would have needed to kill both her and the children because otherwise the children would inherit in their mother's place. On that ground alone the Crown had a strong case. And he was in financial difficulties. The forensics certainly helped, showing that she could not have shot herself , since the results showed the opposite (if I remember correctly, she'd have needed exceptionally long arms,apart from anything else), but were not really needed.