I think the confusion between us is the fact that she did not deal with the issue in evidence, for the reasons I have explained. However she did lie during the trial when the prosecution questioned her privately but quite formally about the matter at the request of the judge.
Further admissible evidence has now come to light and if the case is referred to the Court of Appeal an application will be made for Julie Mugford to attend the Court of Appeal to be cross examined on this issue, and on others.
Okay, and I understand any reluctance to release 'privileged' information, so I will not ask.
But I will guess

I could only imagine that records from the solicitor (Mr Church of Ellisons) regarding the dates of the signing of any contracts, to be sufficient to force that course of action.
If that were the case, and given the number of years that have passed and the effects on witnesses memory, then I'd be surprised if Julie would be called as a witness again for an appeal, I don't see what could be gained from it. Of course I'm just speculating.
Another thing to consider, is what implications it would have, even if it was accepted that the 'NOTW deal' was in place before the trial. Obviously the defence would again question her motivation for giving evidence.