Hmm. That's how they concluded Sheila didn't do it.
I think the trial Judge was very clever indeed ...
He made one big mistake ...
He did not consider Neville being forced to make that call by a third party ...
Therefore he wrongly told the Jury that because of that call it must have been Jeremy or Sheila ...
He was not considering all the possibilities ...
Therefore he did not allow the Jury to consider all the possibilities ...