A senior Conservative MP is calling for an investigation into what he describes as "serious professional failings" surrounding Lucy Letby's conviction.
Sir David Davis, former Brexit Secretary, addressed the Commons Chamber, labelling the case against the neonatal nurse a "miscarriage of justice".
Letby worked as a nurse on the neonatal unit at the Countess of Chester hospital, and was convicted of multiple murders and attempted murders of infants in her care - though she has consistently maintained her innocence.
Mr Davis accused both Cheshire Police and the Crown Prosecution Service of numerous "failures of expertise" throughout their handling of her case.
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Sir David intends to write directly to the Director of Public Prosecutions requesting a formal review of how the case was managed.
The veteran parliamentarian claimed that Cheshire Police failed to adhere to "the letter of the law or best professional practice" by not pursuing "all reasonable lines of inquiry" during their investigation.
According to Sir David, investigators neglected to pursue alternative lines of inquiry and failed to refer the case to appropriate specialist authorities.
He further alleged that proper due diligence was not conducted when appointing key expert witnesses, and that both Cheshire Police and the CPS disregarded advice to select witnesses from an independent panel of experts.
Lucy Letby was convicted of multiple murders and attempted murders of infants in her care
| PA"They failed to engage with real experts about complex statistical evidence and failed to correctly inform the jury of that fact," Sir David told MPs.
He also accused authorities of failing "on several occasions, to disclose critical material to the defence".
The MP drew parallels with the Sally Clark case, where a mother's murder conviction was overturned after three years due to flawed statistical evidence regarding sudden infant death syndrome.
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Cheshire Constabulary has firmly rejected the accusations levelled by Sir David in Parliament.
The force stated it "strongly refutes" his claims of "multiple deviations from best professional practice" during the investigation.
Officers expressed confidence in the integrity of their work, the prosecution's conduct, and the verdicts reached by the courts.
The constabulary criticised those who seek to "destroy reputations" following the former cabinet minister's parliamentary intervention.
Mr Davis accused both Cheshire Police and the Crown Prosecution Service of numerous 'failures of expertise'
| PAIt warned that the "constant noise" surrounding Letby, who was found guilty of killing seven babies, was damaging public trust in the justice system.
Policing minister Sarah Jones responded by urging MPs to exercise caution, stating they must be "very careful to avoid implying impropriety where none has actually been established".
She emphasised that "there has been a proper process involving independent assessment by the CPS, trial by a jury, and two appeal processes that has resulted in the conviction and imprisonment of Lucy Letby".
A CPS spokesman pointed to the strength of the case, noting that Letby was convicted on 15 separate counts across two jury trials.
They added that the Court of Appeal dismissed her application to appeal in May 2024, rejecting arguments that prosecution expert evidence was flawed.
The Criminal Cases Review Commission is currently examining Letby's case after judges turned down her attempts to challenge the convictions.