The whistleblower at the centre of doping allegations against a London-based doctor has accused the UK Anti-Doping Agency of a "catastrophic failure".
Former amateur cyclist and drugs cheat Dan Stevens said the organisation had "absolutely no reason to not investigate" his warnings over Dr Mark Bonar.
Bonar was caught on camera by the Sunday Times, allegedly claiming to have prescribed banned substances to 150 athletes, including Premier League footballers.
Three Premier League clubs issued statements denying their players had used performance-enhancing drugs.
Bonar also denies any wrongdoing.
Ukad says it did begin an investigation into Bonar, but found that he was outside of its jurisdiction as he was not governed by a sport.