Well, I can't argue with what you chose not to believe. I didn't imply any particular extent either.
Try searching for The Secret Barrister's blog, or for any information on Simon Warr, or Paul Gambaccini or Kato Harris or barristerblogger.com or for Anna Raccoon's blog or for Alexander Economou (the authorities were planning to prosecute the woman who accused him, but they got that wrong because she was so mentally fragile that she committed suicide), or look at the justicegap.com, or look for a website called daftmoo.com
Get and read a copy of The Secret Barrister: Stories of the Law and How It's Broken, just published in the last week or so.
Or get and read a copy of Wrongful Allegations of Sexual and Child Abuse, edited by Ros Burnett. The Oxford University has a whole Centre for Criminology.
Those are the possibilities that come to mind immediately.
Failure to disclose evidence is rife throughout the court system and not confined to sexual crime - if you believe a barrister that is.
You won't find things easily because most people falsely accused want nothing more than to hide away and rebuild their lives and their mental health and they don't go blasting their experiences all over the web for the most part and the authorities don't keep statistics on facts that they would rather didn't exist. Any failed trial is a 'failed conviction' in their book, they don't break down the reasons for the failure.
It's always officially 'there wasn't enough evidence for a conviction' never 'we found evidence of innocence'. If you approach this with an open mind, you may find that it's a big black hole that sucks you in and swallows you whole. The information is out there.