There's also the issue of the defence team at trial being made aware of evidence that suggested an accuser was lying but choosing not to use it and a new defence team putting it forward at the appeal and the appeal judges declining to receive it and give the new defence team a "second bite of the cherry". It happened in the Rolf Harris case. See paras 83 and 84 of the appeal judgment.
www.judiciary.uk/wp-content/uploads/2017...-harris-judgment.pdf
I'm convinced the Rolf Harris accuser copied Jimmy Savile's great-niece's story (because the Rolf Harris accuser didn't have a genuine story of her own), as I counted 17 points in common between their two stories AND the Rolf Harris accuser told a women's magazine, in one of her paid pre-trial interviews (still can't fathom how she was allowed to appear in court after that), that she had become "fixated" on child sexual assault cases, which suggested to me that she'd been "researching" the subject online (because she didn't have a genuine story of her own). (And it seems that Jimmy Savile's great-niece's story wasn't even true either, as I seem to remember Amanda saying here that the great-niece hadn't even met Jimmy Savile.)