Tom Hayes, the first banker to be jailed for rigging interest rates, has told the BBC he believes fresh evidence will show his conviction was unsafe.
It raises questions about more than 20 other cases and some of the only bankers prosecuted in the UK since the financial crash.
His case is now being examined by the Criminal Cases Review Commission.
The Serious Fraud Office (SFO) said he was found guilty by a jury and the Court of Appeal upheld the conviction.
“I don’t blame the jury for it but they were presented with a false narrative and they reached a conclusion based on those facts. I believe had they been presented with full evidence they would have reached a very different conclusion,” Mr Hayes – who was jailed for 11 years and served five and a half – told the BBC in his first TV interview since being released.
“This wasn’t an easy sentence. In that time, I lost my mind, I lost my mental health. I suffered deep bouts of depression. I harboured suicidal thoughts often. I was very angry and bitter. I struggled with my emotions.
“Now I sit here in the park and I can smell freedom… but believe me, when you’re sitting in a cell for 23 and a half hours a day with two other gentlemen and there’s not even room to stand up – that’s difficult, very difficult.”
The former UBS trader was found guilty of manipulating Libor, the benchmark that tracks the interest rate banks pay to borrow cash from each other.
The new evidence is part of eight grounds of appeal now being examined by the Criminal Cases Review Commission (CCRC), the body set up to review allegations of miscarriages of justice.
In 2015, the SFO called Tom Hayes the “ringmaster” of an international conspiracy to rig interest rates. After a jury returned a guilty verdict, he became the first UK banker to be jailed since the financial crash.