I know you said that it would be in conjunction with other points. My other post points to that as a basis for saying that your own post is just a way of admitting that it ISN'T a ground for appeal. And it isn't. Her evidence proved nothing. But I don't care about Julie Mugford, go ahead.
I think I'm done here. I've learned what I want to learn about this case.
Julie Mugford's evidence was very important and alongside the evidence relating to the sound moderator was one of the two central planks of the prosecution case. Her evidence in essence was that JB admitted to her his guilt. If her evidence can be undermined to a significant extent, particularly in conjunction with other new evidence casting doubt on the sound moderator evidence and in relation to other evidence, the convictions might be overturned. That is what I have been saying, no more and no less.
If you want to learn more about these points you could use the search facility here to review some of the old threads. Early 2012 would be a very good place to start. A lot of this was covered in far greater detail then.