LUCY LETBY CASE FACES FRESH QUESTIONS AS NEW MEDICAL EVIDENCE AND HOSPITAL FAILURES COME UNDER SCRUTINY

The case of convicted neonatal nurse Lucy Letby is facing renewed scrutiny after new expert analysis and whistleblower testimony raised questions about some of the medical evidence presented during her trial.

Letby was convicted of murdering seven babies and attempting to murder seven others while working at the Countess of Chester Hospital between 2015 and 2016. She is serving 15 whole-life orders and has consistently denied the allegations.

Her previous appeals were unsuccessful. However, her legal team has submitted fresh material to the Criminal Cases Review Commission (CCRC), which is examining whether the case should be referred back to the Court of Appeal.

NEW EXPERTS CHALLENGE PARTS OF THE MEDICAL CASE

One of the most significant developments involves Canadian neonatologist Professor Shoo Lee and an international group of medical experts.

According to reporting by The Independent, the panel reviewed thousands of pages of medical evidence and disputed aspects of the prosecution’s interpretation of several babies’ deaths and collapses.

The experts have proposed alternative medical explanations in some cases, including infection, respiratory complications and problems with medical care. They have also questioned the prosecution’s interpretation of evidence concerning alleged air embolisms.

These opinions are now part of the material being considered in the ongoing legal process. They have not, however, resulted in Letby’s convictions being quashed.

QUESTIONS OVER THE INSULIN EVIDENCE

Another disputed issue concerns two babies, known during the trial as Baby F and Baby L, whose cases involved allegations of insulin poisoning.

A recent investigation by The Sun reported that medical records concerning Baby F contained additional normal glucose readings that were not included in material presented to the jury.

The newspaper reported that experts it consulted believe the broader clinical picture could support an alternative explanation involving infection.

Those claims remain contested and have not been judicially established as proof that the convictions were unsafe.

HOSPITAL FAILURES ALSO EXPOSED

Separately, the long-awaited Thirlwall Inquiry published its final report on September 15, 2026.

The official inquiry examined events at the Countess of Chester Hospital and found serious failures in management, governance and safeguarding.

Lady Justice Thirlwall said there had been a “complete failure” at multiple levels to invoke safeguarding procedures once concerns arose that babies might be deliberately harmed.

The inquiry also found that some babies might have survived or avoided serious harm if hospital leaders and doctors had acted differently when concerns about Letby emerged.

However, the inquiry was not an appeal court and did not overturn Letby’s convictions.

THE SEWAGE AND PLUMBING QUESTIONS

Recent reporting and documentaries have also brought renewed attention to problems within the hospital, including concerns about infrastructure, medical care and wider institutional failures.

But claims that a secret or “classified” medical report has conclusively proved that the babies died from alternative causes are not supported by the official inquiry material currently available.

Likewise, there is no established finding that the trial court deliberately ignored such a report.

Instead, there are competing interpretations of the medical evidence, with Letby’s legal team arguing that newly presented expert material deserves further examination while other experts have rejected some of those challenges.

Two scientists who had previously been involved with Letby’s defence team recently withdrew, saying they could not support arguments they believed were inconsistent with available evidence, science and established physiology.

THE LEGAL BATTLE IS NOT OVER

The CCRC is continuing to consider the fresh material submitted on Letby’s behalf.

Her barrister Mark McDonald has expressed confidence that the case will be referred back to the Court of Appeal, although that remains a matter for the CCRC and, potentially, the courts rather than a settled outcome.

At the same time, Cheshire Police’s separate Operation Duet investigation into possible corporate and gross-negligence manslaughter at the hospital remains ongoing.

Three former senior members of the hospital leadership team were arrested in 2025 on suspicion of gross negligence manslaughter and remain on bail, while another person arrested in connection with a separate investigation into alleged perverting the course of justice also remains on bail.

WHAT HAPPENS NEXT?

For now, Lucy Letby’s convictions remain in force.

The new medical arguments, disputed evidence surrounding individual babies and evidence of serious hospital failures could become important to the CCRC’s assessment, but they have not yet legally established that Letby was wrongly convicted.

The central question now is whether the fresh material meets the legal threshold for another appeal.

And with the CCRC examining the new evidence while separate investigations continue into the hospital’s leadership and care failures, one of Britain’s most closely watched criminal cases remains far from finished.