It would be sufficient to constitute a ground of appeal and taken with other new material could be sufficient to overturn the convictions, not on a technicality but because the convictions could no longer be regarded as safe.
So this technicality may be what Bamber is going to present to the CCRC. If ever there is another submission.
If the signed contracts were after Julie's testimony but before the verdict, is that still illegal ?
Signing contracts before Julie's testimony could motivate her to lie under oath to attempt to get a conviction. However after her testimony, she can't influence the trial.
As mentioned, I don't believe Julie's or the NOTW's lawyers would make such a huge error with contract signing dates. Espescially as Julie won't be needed if there was a not guilty verdict.