Not exactly the same point, but from The Lawyer's last article:
"In the extreme, there might need to be a complete re-trial because of some exceptional circumstance. That is extremely unlikely, but it does sometimes happen. In 2021, the Court of Appeal ordered a re-trial following a five week High Court hearing in a case between
Natwest Markets and Bilta. Mr Justice Snowden had taken 19 months to hand down judgment.
“A judgment given in a timely fashion can be assumed to have been prepared with a full recollection of the relevant evidence,” the Court of Appeal said. “However, the 19-month delay means we cannot make that assumption.
“Having subjected this judgment to the appropriate degree of scrutiny in light of the delay, we are not satisfied that the judge’s findings and conclusion on this key issue were right. We have reluctantly concluded that in fairness the judgment cannot be allowed to stand.”"
So, not an issue of time limitation, but the idea that an appeal doesn't lead to a full review of all the evidence may not be cast in stone. Depends on the nature of the appeal, I suppose.
Can you imagine a "re-trial"?