Lucy Letby case expert witness was under fitness to practise investigation during trial

A doctor who gave crucial expert evidence about insulin poisoning for the prosecution of the nurse Lucy Letby was under investigation by the medical regulator at the time due to serious concerns about his fitness to practise.

The General Medical Council (GMC) opened an investigation into concerns about Prof Peter Hindmarsh, including that he had harmed patients, on the first day he gave evidence at Letby’s trial in late 2022.

The GMC investigation was still continuing when Hindmarsh gave evidence for a second time at the Letby trial three months later. Great Ormond Street hospital reported Hindmarsh to the GMC after a formal investigation led by his main employer, University College London hospitals trust (UCLH).

The jury in the trial of the nurse, who was convicted of murdering babies in the Countess of Chester hospital’s neonatal unit, was never informed about any investigation into Hindmarsh, one of the prosecution’s key witnesses.

While the GMC conducted its investigation, and during some of the period when Hindmarsh gave evidence, a medical tribunal ordered severe restrictions on his work, saying that he “may pose a real risk” to members of the public. The tribunal also considered the allegations about Hindmarsh “may have the potential to impact on his ability to act as an expert witness”.

Nevertheless, the tribunal permitted him to continue giving expert evidence for the prosecution of Letby. The Crown Prosecution Service told the defence it would oppose any attempt to inform the jury of the GMC investigation, on the basis that the allegations had not reached a final adjudication.

Ultimately the GMC investigation was never concluded, because Hindmarsh removed himself from the GMC register, a process known as “voluntary erasure”. That effectively ended the investigation, and there was no regulatory finding against him.

Read full story

Source: The Guardian, 3 March 2026