Lucy Letby: The Killer Questions

File on 4 examines some of the most contentious statistical, scientific and medical evidence in the Lucy Letby trial. The programme reveals new concerns involving medical evidence presented in court where Letby was convicted of murdering seven babies and attempting to murder seven others.

Reporter: Stephanie Hegarty
Producers: Fay Nurse, Ben Robinson and Hayley Mortimer
Technical Producers: Richard Hannaford and Nicky Edwards
Production Coordinator: Tim Fernley
Editor: Carl Johnston