LUCY LETBY CASE: 100-PAGE INSULIN REPORT FUELS FRESH QUESTIONS OVER KEY TRIAL EVIDENCE

LONDON — The Lucy Letby case is once again under intense scrutiny after a new 100-page expert analysis was submitted to the Criminal Cases Review Commission, challenging important aspects of the insulin evidence used at her trial.

The latest development comes as Letby’s legal team continues its effort to have her convictions reviewed.

Letby was convicted of murdering seven babies and attempting to murder seven others at the Countess of Chester Hospital between 2015 and 2016.

She remains in prison serving whole-life sentences.

But her legal team argues that significant questions remain over the scientific evidence presented to jurors.

A NEW CHALLENGE TO THE INSULIN EVIDENCE

The 100-page analysis was reportedly prepared by consultant neonatologist Neil Aiton and statistician Hilde Wilkinson-Herbots.

The report challenges evidence given by prosecution insulin expert Professor Peter Hindmarsh.

Among its claims are that potential alternative explanations for the babies’ abnormal insulin results were not adequately presented to the jury.

It also reportedly raises questions about whether the alleged insulin poisoning could have occurred during shifts when Letby was not working.

The full report has not been publicly released, meaning its claims have not yet been tested in court.

WHY THE INSULIN CASES MATTER

The insulin allegations were particularly significant during Letby’s original trial.

Prosecutors argued that two babies had been deliberately poisoned with insulin and presented the cases as powerful evidence of intentional harm.

The prosecution’s interpretation of the medical results became an important part of the wider case against Letby.

Now, experts supporting her appeal argue that the medical evidence should be reconsidered in light of additional analysis and alternative explanations.

Earlier expert criticism had already challenged aspects of the insulin evidence, with an international panel arguing that the scientific interpretation presented at trial was problematic.

THE CCRC IS NOW CONSIDERING THE CASE

The Criminal Cases Review Commission received a preliminary application on Letby’s behalf in February 2025.

Since then, additional expert reports, submissions and defence material have been provided.

The CCRC confirmed that its review is underway but stressed that it does not decide whether someone is innocent or guilty.

Its role is to determine whether there is a real possibility that a conviction may not be upheld by an appeal court because of new evidence or legal arguments.

That means the latest report does not mean Letby has been cleared.

Her convictions remain in place.

QUESTIONS BEYOND THE INSULIN EVIDENCE

The renewed scrutiny is no longer limited to the insulin cases.

Experts and campaigners have also questioned aspects of the statistical evidence, the interpretation of medical events and the circumstances inside the neonatal unit.

A recent review of the case has highlighted continuing debate over the so-called shift chart and other evidence used to connect Letby to the babies’ collapses.

The Thirlwall Inquiry is separately examining what happened at the Countess of Chester Hospital and the wider institutional response.

However, the inquiry itself cannot overturn Letby’s convictions.

A CASE THAT REMAINS DEEPLY DIVISIVE

Letby’s convictions remain one of the most closely debated criminal cases in Britain.

For the families of the babies involved, the convictions represented accountability for an extraordinary series of tragedies.

For Letby’s supporters and a growing group of experts, the case has raised questions about whether complex medical evidence was interpreted correctly and whether alternative explanations received enough consideration.

Those competing arguments are now being examined through the formal review process.

WHAT HAPPENS NEXT?

The biggest question is whether the CCRC will ultimately conclude that the new evidence creates a realistic possibility that Letby’s convictions could be overturned.

For now, there is no such decision.

The 100-page insulin analysis is another submission for investigators to examine alongside the substantial body of evidence already provided.

And as scrutiny intensifies, one question continues to dominate the case:

If the scientific evidence at the heart of the prosecution case is shown to have been seriously flawed, could it change the legal fate of Lucy Letby?

For now, the answer remains unknown.