May 2026: Thirlwall Inquiry report delayed to at least September 2026 · six-baby inquests relisted to 2027 · CCRC review active · Shoo Lee Panel: no medical evidence of deliberate harm.
Trial prosecution v. post-conviction experts
A topic-by-topic map of where named experts agree and disagree, plus the full roster of reviewers on both sides. Each card links to the biographical page where one exists; each carries a claim-status and source-reliability tag. The convictions stand — these are the dispute points feeding the CCRC review.
Ten core disputed topics, with the prosecution position on the trial record alongside the post-conviction expert challenge. Click through for the full source-linked evidence card.
| Topic | Prosecution / trial | Post-conviction expert challenge | See |
|---|---|---|---|
| Air embolism | Crown experts (Evans, Bohin) treated skin-mottling patterns as diagnostic of intravenous air embolism, citing Lee & Tanswell (1989). | Lee himself states the descriptions do not match his 1989 criteria. The Panel found no objective evidence of air embolism in the cases reviewed. | Read full → |
| Insulin and C-peptide | Roche immunoassay ratios from the Royal Liverpool laboratory were treated as forensic proof of exogenous insulin. | Independent clinical biochemists (Ismail, Chase, Senn, Allegaert) argue the assay was not forensically validated and no mass-spectrometry confirmation was performed. | Read full → |
| Shift-rota chart and statistical inference | The chart was presented as visually compelling evidence of association between the defendant's presence and a curated set of events. | The RSS, Gill, Fenton, Hutton, Spiegelhalter, Green, Schneps and O'Quigley each identify selection bias, base-rate neglect and Texas-sharpshooter logic. Standards established after Sally Clark were not met. | Read full → |
| Handwritten notes (Post-its) | Notes including 'I am evil I did this' were treated by the Crown as confessional material. | Defence and post-conviction commentators argue the notes match self-blame psychology in clinicians under sustained accusation, a documented pattern in the patient-safety literature. | Read full → |
| Child K — alleged eyewitness count | Dr Ravi Jayaram gave 2024 retrial evidence of observing the defendant standing over Child K without acting during desaturation; conviction on one count of attempted murder. | Independent clinicians (Hummler and others) have published technical analysis of the ET-tube and ventilation mechanism, arguing the timing and physiology are consistent with displacement and re-intubation. | Read full → |
| NEC vs air-injection on radiology | 'Air' findings on imaging were attributed to deliberate injection. | Independent paediatric radiologists have re-read the imaging and argue findings are consistent with NEC (pneumatosis intestinalis, portal venous gas). | Read full → |
| Late-onset sepsis differential | Sepsis was not advanced by the Crown as a primary explanation for the collapses on the indicted counts. | Post-conviction expert review argues sepsis was not adequately excluded as a primary cause before attribution to deliberate harm. | Read full → |
| Liver-injury and post-mortem findings | Liver findings in some cases were attributed to deliberate trauma. | Independent paediatric-pathology re-readings (filed October 2025 as supplementary CCRC material) and resuscitation-trauma literature argue for natural and resuscitation-related explanations. | Read full → |
| RCPCH 2016 invited review | Used at trial as a backdrop to the prosecution timeline. | Post-trial analysis questions the scope and limits of the RCPCH review and how its findings were interpreted by Trust and investigators. The review did not identify a perpetrator. | Read full → |
| Door-swipe data mislabelling | Door-swipe records were used at trial to place Letby on the unit at relevant times. The Crown treated the records as objective placement evidence. | The CPS confirmed in August 2024 that swipe data for one of the unit's doors had been mislabelled — entries and exits reversed. The bad data was relied on in evidence relating to nine infants and played a central role in the Child K count. A second door did not record entries or exits at all. | Read full → |
| Crown insulin expert's GMC investigation — non-disclosure to jury | Prof. Peter Hindmarsh gave expert evidence for the Crown on the insulin counts (Babies F and L) at the 2022–2023 trial. | The GMC opened a fitness-to-practise investigation into Hindmarsh the same day he began giving evidence; a medical tribunal concluded the allegations 'may have the potential to impact on his ability to act as an expert witness'. The jury was never told. Hindmarsh voluntarily erased himself from the GMC register on 14 November 2024, ending the investigation without a regulatory finding. | Read full → |
| Expert-evidence methodology and disclosure | Dr Dewi Evans was the principal medical reviewer of all counts; Dr Sandie Bohin served as corroborating expert. | Independent expert critique (Heneghan, Goldacre) and legal commentary (Mansfield, Kennedy, Sumption) argue the methodology fails EBM standards and may engage the Cannings principle. | Read full → |
Lead causation expert at trial
Main contribution: Provided the principal medical-causation narrative across the indictment, diagnosing air embolism, exogenous insulin and gastric-air administration as mechanisms of harm.
Key claim: Skin-discolouration patterns and gas findings were diagnostic of deliberate harm via intravenous air, insulin administration and air-in-stomach.
Criticism: Methodology rejected by the 14-member Shoo Lee International Expert Panel (Feb 2025). Lee himself states the prosecution misapplied his 1989 paper. A family court judge separately described an unrelated Evans expert report as 'worthless' (2023). Self-referred to Cheshire Police; out of routine NICU practice for over a decade at the time of trial.
Related evidence
Second-opinion neonatology expert at trial
Main contribution: Largely corroborated Dr Evans's conclusions at trial.
Key claim: Supported the air-embolism and insulin theories advanced by Dr Evans.
Criticism: Independent neonatologists argue her conclusions rest on the same methodology as Dr Evans's and inherit its limitations — same-methodology-second-clinician rather than independent corroboration.
Related evidence
Reviewing pathologist for the prosecution
Main contribution: Re-read original autopsy material on behalf of the Crown.
Key claim: Identified pathology findings the Crown argued were consistent with the deliberate-harm mechanisms.
Criticism: Independent paediatric-pathology re-readings filed October 2025 (supplementary CCRC submissions) argue the preserved post-mortem material is compatible with natural pathology.
Related evidence
Paediatric radiology expert for the prosecution
Main contribution: Gave post-mortem radiology evidence for the Crown.
Key claim: Radiological findings were consistent with the prosecution's mechanisms (intravascular gas, air-in-stomach).
Criticism: Independent paediatric radiologists have re-read the imaging and argue the findings are more consistent with NEC, sepsis and other natural causes than with the prosecution's deliberate-harm framing.
Related evidence
Crown's insulin expert
Main contribution: Endocrinology evidence on the two insulin counts (Babies F and L) at the 2022–2023 trial.
Key claim: Low insulin-to-C-peptide ratios were diagnostic of exogenous insulin administration.
Criticism: The GMC opened a fitness-to-practise investigation into Hindmarsh on the same day he began giving evidence at the Letby trial in late 2022; the medical tribunal concluded the allegations 'may have the potential to impact on his ability to act as an expert witness' but the jury was never told. Hindmarsh removed himself from the GMC register through voluntary erasure on 14 November 2024, ending the investigation without a regulatory finding. Independent clinical biochemists (Ismail, Chase, Senn) have separately argued the Roche immunoassay used at trial was not forensically validated and that confirmatory mass spectrometry was not performed.
Related evidence
Defence neonatology expert at trial
Main contribution: Instructed neonatology expert for the defence at the original trial. His post-trial public commentary is a rare direct insider account of what the defence saw and how the medical evidence was received.
Key claim: Mechanisms advanced by the Crown were not the only available explanations for the observed collapses; natural-cause differentials were available.
Related evidence
Chair, International Expert Panel (Feb 2025)
Main contribution: Convenor of the 14-member International Expert Panel that reviewed the medical evidence for every indicted count. Lead author of the 1989 air-embolism paper cited by the prosecution.
Key claim: The skin signs described at trial do not match the findings in his own 1989 paper. The Panel found no medical evidence of deliberate harm in any case reviewed.
Related evidence
Panel member — UK neonatal medicine
Main contribution: Past President RCPCH; UK Panel member. Senior UK neonatologist publicly calling for an urgent review of the convictions.
Key claim: The medical evidence underpinning the convictions warrants urgent independent review.
Related evidence
Panel member — perinatal medicine
Main contribution: UK Panel member. Patient-safety and just-culture perspective on what a struggling unit under strain looks like.
Key claim: Unit conditions and human-factors context were not adequately reflected in the trial reading of the collapses.
Related evidence
Panel member — perinatal epidemiology
Main contribution: LSHTM Panel member. Brings population-epidemiology calibration to the cluster question.
Key claim: The Countess of Chester cluster needs to be read against population baselines, not against the unit's own quiet years.
Related evidence
Panel member — Karolinska
Main contribution: Swedish Panel member; leads the Swedish Neonatal Quality Register.
Key claim: Findings consistent with natural causes in unstable preterm infants on a Level-2 unit; no objective evidence of deliberate harm in the cases reviewed.
Related evidence
Panel member — Australia/NZ Neonatal Network
Main contribution: ANZNN founder. Population-outcomes perspective against which clusters should be baselined.
Key claim: Cluster-attribution requires comparator population data the trial did not have.
Related evidence
Panel member — Canadian Neonatal Network
Main contribution: Director, Canadian Neonatal Network. Population-outcomes calibration to the case-by-case review.
Key claim: Findings consistent with the natural-cause differential expected on a Level-2 unit handling sub-designation gestation babies.
Related evidence
Panel member — teaching-hospital neonatology
Main contribution: Toronto-based Panel member. Teaching-hospital frame on what a modern neonatologist would recognise on the casebook.
Key claim: The trial reading of the indicted cases is not what training programmes would teach.
Panel member — practising UK NHS consultant
Main contribution: Working-UK-clinician verification that the Panel's reading is calibrated to actual NHS practice.
Key claim: Findings on the cases reviewed match what a working UK neonatologist would expect to see.
Panel member — Ulm; neonatal ventilation
Main contribution: German Panel member. Research focus on neonatal ventilation and lung physiology.
Key claim: Several indicted cases turn on ventilation and ET-tube events whose physiology is consistent with the natural-cause differential.
Related evidence
Panel member — KU Leuven; neonatal pharmacology
Main contribution: Belgian Panel signatory. Calibrates the Panel's reading of drug- and insulin-related strands.
Key claim: Insulin-related findings are not pharmacologically consistent with the Crown's theory of administration.
Related evidence
Panel member — Taiwan; preterm-lung development
Main contribution: Taiwanese Panel signatory. East Asian neonatology perspective.
Key claim: Cases reviewed match natural-cause patterns recognised in international preterm-lung literature.
Panel member — Louisiana State University
Main contribution: US Panel signatory; LSU neonatology programme.
Key claim: Endorses the Panel's case-by-case reading from a US clinical-tradition perspective.
Panel member — Tulane University
Main contribution: US Panel signatory; Tulane neonatology programme.
Key claim: Endorses the Panel's case-by-case reading.
Independent clinical biochemist
Main contribution: Published authority on insulin-immunoassay interference. Established that the Roche assay used in the case is not a forensic test.
Key claim: The Roche insulin immunoassay can produce the trial result via auto-antibodies, sepsis, adrenal suppression and other non-exogenous-insulin causes; confirmatory mass spectrometry was not performed.
Related evidence
Independent physiological-modelling expert
Main contribution: Demonstrates that the reported insulin values are not plausible on the Crown's theory; the numbers belong to adult attempted-suicide presentations, not to an infant spiked via a TPN bag.
Key claim: On the Crown's own theory of administration, the recorded insulin values are not physiologically reachable.
Related evidence
Biomedical scientist (science4justice.nl)
Main contribution: 'The insulin question' (Oct 2023) remains the canonical plain-English summary of why the Letby insulin evidence fails a forensic standard.
Key claim: Roche Cobas manufacturer guidance, the 2010/2012 Liverpool lab protocol change, false-positive literature, and sample-handling failures undermine the forensic use of the assay.
Related evidence
Diving-medicine specialist (RN Submarine Escape Tank)
Main contribution: Retired Royal Navy diving-medicine consultant. Air-embolism mechanism specialist with operational hyperbaric experience.
Key claim: The volumes, vascular access points and time-course alleged at trial are not consistent with the operational physiology of intravenous air embolism in a preterm infant.
Related evidence
Retired consultant obstetrician
Main contribution: Case-by-case clinical analysis of Children A/B, C, D, O and P, with attention to obstetric history.
Key claim: Per-case clinical record supports natural-cause readings for the cases analysed.
Microbiologist; hospital infection-control specialist
Main contribution: Pseudomonas/sewage and infection-control angle on the unit's documented environmental issues.
Key claim: Documented infection-control failures on the unit during the indictment period are part of the natural-cause differential.
Related evidence
UK paediatric neuropathologist
Main contribution: Shaken Baby Syndrome miscarriage-of-justice profile. Independent paediatric-neuropathology perspective on disputed post-mortem inferences.
Key claim: Forensic over-attribution of trauma findings to single mechanisms is a recurring problem in paediatric pathology and applies to the Letby record.
Related evidence
NHS consultant neonatologist; GMC complainant
Main contribution: Co-filed (with Roger Norwich) a formal GMC complaint regarding the prosecution expert evidence of Dr Dewi Evans, on the basis that the trial expert evidence did not meet professional standards.
Key claim: The theories proposed in court were not plausible and the prosecution was full of medical inaccuracies. While she cannot assert Letby's innocence, she sees 'no proof of guilt'.
Related evidence
Insulin physiological-modelling collaborator
Main contribution: Collaborator with Prof. Geoff Chase on the physiological-modelling analysis of the insulin values reported in the Letby case.
Key claim: On the Crown's theory of administration, the reported insulin values would have required quantities of insulin far in excess of what the alleged mechanism could deliver.
Related evidence
World-leading expert on confession evidence
Main contribution: Emeritus Professor of Forensic Psychology, King's College London. Author of the canonical scholarly work on false confessions; gave evidence in the appeals of the Guildford Four, Birmingham Six, Stefan Kiszko, Judith Ward, Derek Bentley and Sally Clark. Creator of the Gudjonsson Suggestibility Scale.
Key claim: Interviewed Lucy Letby twice in summer 2025 and produced a report addressing the psychology of the handwritten notes found at her home, applying the established literature on self-blame writing by individuals under sustained institutional accusation.
Related evidence
Forensic psychology — applied criminology
Main contribution: Programme lead of Applied Criminology and Forensic Psychology at Edinburgh Napier University. Featured in the Channel 5 documentaries 'Lucy Letby: Did She Really Do It?' (October 2024) and 'Lucy Letby: The New Evidence' on the psychology of the handwritten notes and clinician-under-investigation framing.
Key claim: The handwritten notes reflect extreme mental distress in an experienced and trusted nurse under sustained accusation; not forensic confession.
Related evidence
Director, Oxford Centre for Evidence-Based Medicine
Main contribution: Flagship UK EBM voice. Sustained public commentary applying the EBM framework to the Letby evidence.
Key claim: The Crown's medical methodology does not meet EBM standards.
Related evidence
Professor of Evidence-Based Medicine, Oxford
Main contribution: Author of Bad Science and Bad Pharma. Framework for identifying unreliable medical claims applied to the Letby evidence.
Key claim: The Crown's medical case displays features the Bad Science framework would flag as unreliable.
Related evidence
Mathematical statistics; Lucia de Berk lead
Main contribution: Led the statistical critique that overturned Lucia de Berk's conviction. Public author of the statistical critique of the Letby shift-rota chart since 2023.
Key claim: The shift-rota chart is a textbook example of selection bias (the Texas sharpshooter fallacy).
Related evidence
Bayesian networks in legal evidence
Main contribution: Sustained Bayesian-network analysis of the Letby evidence. The most detailed publicly available Bayesian critique.
Key claim: Posterior probability of guilt on the trial evidence does not meet the criminal-law threshold.
Related evidence
Medical statistics (Warwick)
Main contribution: Operational analysis of the Letby shift-rota chart identifying four specific methodological failures.
Key claim: The chart conflates rate and count, uses the wrong denominator, has no null-hypothesis comparison, and pattern-matches against pre-selected events.
Related evidence
Statistics (Cambridge); past-president RSS
Main contribution: UK's most widely recognised statistical-communicator voice. Framework for statistical evidence in criminal trials applied directly to the Letby chart.
Key claim: Statistical-evidence standards established after Sally Clark apply to the Letby chart and were not met.
Related evidence
Statistics (Bristol); past-president RSS
Main contribution: UK-specific statistical commentary on the shift-rota chart referencing RSS post-Sally-Clark guidance.
Key claim: The presentation of the chart to the jury did not meet the RSS post-Clark framework.
Related evidence
Mathematician; 'Math on Trial' author
Main contribution: 'Math on Trial' (2013) is the canonical popular reference on mathematical fallacies in criminal trials. Four catalogued fallacies apply directly to the Letby chart.
Key claim: The chart exemplifies multiple recognised mathematical fallacies in criminal-trial evidence.
Related evidence
Emeritus Professor of Statistics, UCL
Main contribution: Published proportional-hazards correction to the shift-chart reading.
Key claim: Proper proportional-hazards treatment of the shift data does not support the inference offered to the jury.
Related evidence
Statistician and methodologist (Edinburgh)
Main contribution: Statistical-evidence critique with direct relevance to healthcare-serial-killer prosecutions.
Key claim: The methodological standards required for statistical evidence in serial-attribution cases were not met.
Related evidence
Former Supreme Court Justice
Main contribution: Former Supreme Court Justice (2012–2018). One of the most senior retired English judges to call publicly for the safety of the convictions to be reviewed.
Key claim: On the public evidence, there is a serious case that the convictions are unsafe and warrant CCRC referral.
Civil-liberties barrister
Main contribution: Career miscarriage-of-justice silk (Birmingham Six, Guildford Four, Hillsborough). Public commentary since 2023 identifying the Letby case as a miscarriage in the making.
Key claim: The Letby case displays the structural features of previous English miscarriages of justice.
Doughty Street barrister; Labour peer
Main contribution: Senior UK barrister; career focus on miscarriages of justice and systemic prejudice against women defendants.
Key claim: The procedural and evidential framework of the Letby case warrants the CCRC review.
Founder of Doughty Street Chambers
Main contribution: Human-rights barrister; commentary on expert-evidence standards and CCRC referral mechanics.
Key claim: Expert-evidence standards required for serial-attribution prosecutions were not met.
Emeritus Professor of Criminal Justice Studies, Leeds
Main contribution: Co-editor of the canonical UK academic reference works on miscarriages of justice.
Key claim: The October 2025 supplementary CCRC submissions operationalise the established miscarriage-of-justice framework.
Medico-legal expert; GMC complainant
Main contribution: Co-filed (with Dr Svilena Dimitrova) a formal GMC complaint regarding the prosecution expert evidence in the Letby trial.
Key claim: Both Crown expert witnesses failed to provide balanced, impartial views, instead giving the court opinions that would not be supported by most doctors.
Related evidence
Human-rights lawyer; founder of Reprieve
Main contribution: Long-running miscarriage-of-justice campaigner. Public engagement with the Letby case post-Panel.
Key claim: The Letby record warrants the same disciplined re-examination as previous miscarriage-of-justice cases.
External neonatology reviewer; Liverpool Women's Hospital
Main contribution: Consultant neonatologist; Thirlwall Inquiry external reviewer.
Key claim: Inquiry evidence on the unit's clinical capability during the indictment period.
External neonatology reviewer; Thirlwall witness
Main contribution: Consultant neonatologist; Thirlwall external reviewer.
Key claim: Inquiry evidence on the unit's neonatal practice during the indictment period.
External senior-nurse reviewer; Thirlwall witness
Main contribution: Senior neonatal nurse; Thirlwall external reviewer.
Key claim: Inquiry evidence on nursing standards and handover practice on the unit.
UK statistics professional body
Main contribution: Post-Sally-Clark framework on statistical evidence in criminal trials. Sustained engagement with the shift-rota chart.
Key claim: Statistical evidence in cases of this structure should meet the RSS post-Clark framework. The chart presentation did not.
Related evidence
UK paediatrics professional body
Main contribution: Conducted the 2016 invited review of the Countess of Chester neonatal unit; ongoing engagement with the case via guidance evolution.
Key claim: Clinical-care concerns identified by the 2016 review; the review did not identify a perpetrator.
Related evidence
Convened by Dr Shoo K. Lee — Professor Emeritus of Paediatrics, University of Toronto; former Paediatrician-in-Chief, Mount Sinai Hospital Toronto.
Dr Shoo Lee
Chair, Professor Emeritus of Paediatrics, University of Toronto
Canada
Dr Neena Modi
Professor of Neonatal Medicine, Imperial College London
United Kingdom
Dr Mikael Norman
Professor of Paediatrics, Karolinska Institutet
Sweden
Dr Helmut Hummler
Professor of Neonatology, Ulm University
Germany
Dr Karel Allegaert
Professor of Paediatrics, KU Leuven
Belgium
Dr Prakesh Shah
Professor of Paediatrics, University of Toronto
Canada
Dr Brian Darlow
Emeritus Professor of Paediatrics, University of Otago
New Zealand
Dr Shabih Manzar
Professor of Paediatrics, Louisiana State University
United States
Dr Minesh Khashu
Professor of Perinatal Medicine, Bournemouth University
United Kingdom
Dr Hannah Blencowe
Associate Professor, London School of Hygiene & Tropical Medicine
United Kingdom
Dr Tsu F. Yeh
Professor Emeritus of Paediatrics
Taiwan
Dr Richard Taylor
Professor of Paediatrics, Tulane University
United States
Dr Douglas Campbell
Associate Professor, University of Toronto
Canada
Dr Stephen Hall
Consultant Neonatologist
United Kingdom
Reported by:
The conflict map records where experts have publicly disagreed. It is not a quorum count; a higher number of experts on one side does not by itself decide the question. Each expert’s claim is labelled by claim-type and source level so the reader can judge the weight to give it. The convictions currently stand; the CCRC review is not a finding of innocence or guilt.
For the methodology behind the source-reliability scale see source-reliability methodology. For the editorial limits see what this site is not saying. For a comparator on the wider problem of expert-witness reliability in English criminal trials, see the Tom Hayes biography (LIBOR exoneree; UK Supreme Court 2025).