Q2 2026 — April–June 2026
Statisticians converge: roster chart 'should not have been shown to jurors'
Prof. Richard Gill publishes a formal critique of Prof. John O'Quigley's peer-reviewed December 2025 roster-chart paper. The two statisticians dispute the modelling details, but Gill 'strongly agree[s]' that from a forensic statistical point of view the roster chart is 'fake evidence which should not have been shown to jurors'.
Letby's 2016 grievance report published — complaint against consultants upheld
The Countess of Chester's internal November 2016 investigation into Letby's grievance over her redeployment is published on the Thirlwall Inquiry website. It upheld her complaint, recommended her return to the unit, and criticised suspicions 'based on "gut feel"' — recommending the two consultants' conduct be considered for further investigation under trust policies.
May 2026 rollup — where the case stands today
Sixteen months on from the February 2025 Shoo Lee Panel, fifteen months on from the May 2024 Court of Appeal refusal, and four months on from the CPS declining the eleven further charges, the case is in an active CCRC-review phase that has now overtaken the institutional-inquiry process: the Thirlwall final report was formally delayed on 13 May 2026 to at least September 2026, and the corresponding six-baby inquests were relisted to provisionally 10 May 2027. Operation Duet (the corporate-manslaughter investigation, separate from Operation Hummingbird) progressed on 23 April 2026 with the re-arrest of a senior former Trust executive on suspicion of perverting the course of justice. This is the consolidated May 2026 status snapshot.
Six-baby inquests relisted into 2027 — coroner waits for Thirlwall
The HM Coroner relists the inquests into the deaths of six of the babies Letby was convicted of murdering. The full hearings, originally scheduled to begin September 2026, will now provisionally begin on 10 May 2027 and the matter will be reviewed again in November 2026. The coroner cites the need for the Thirlwall Inquiry's findings to be fully considered before the inquests proceed. The decision means the cluster of formal public-record processes that were expected to converge in 2026 — Thirlwall report, inquests, CCRC pathway — will instead unfold sequentially across 2026 and 2027.
Thirlwall Inquiry final report formally delayed — not before parliamentary summer recess
The Inquiry confirms its final report will not be published until at least after Parliament's summer recess, with the practical effect that publication is now expected at the earliest in September 2026. This is the third successive delay in the publication timetable (originally pre-March 2025; then Autumn 2025; then early 2026; then after Easter 2026). The Inquiry's terms of reference continue to exclude any re-evaluation of the criminal convictions — the carve-out remains live. The HM Coroner has cited the delay as the reason for relisting the Letby-related inquests into 2027 (see separate entry).
Peer-reviewed insulin research — 'impossible' readings 'effectively quite common'
The Journal of Diabetes Science and Technology publishes peer-reviewed research by Prof. Geoff Chase and Helen Shannon: around four in ten preterm babies have high insulin readings, and insulin-binding antibodies can keep measured levels elevated. Prof. Chase: 'This "impossible" result is effectively quite common.'
Spring 2026 rollup — where the case stood at end-April
Fifteen months on from the February 2025 Shoo Lee Panel, fourteen months on from the May 2024 Court of Appeal refusal, and three months after the CPS declined the eleven proposed further charges, the case is in an active CCRC-review phase. The Thirlwall Inquiry final report was originally expected after Easter 2026 but, as of the April-25 snapshot, the Inquiry had signalled further delay (subsequently confirmed on 13 May 2026). A Netflix-driven public re-engagement is underway. This is the April-2026 status snapshot — superseded by the 17 May 2026 rollup.
Senior former Trust executive re-arrested — perverting the course of justice
Cheshire Police confirm that one of the three former senior leadership-team members arrested on 30 June 2025 on suspicion of gross negligence manslaughter has been re-arrested on suspicion of perverting the course of justice. The re-arrest follows the execution of a search warrant on 22 April 2026. The investigation — known operationally as Operation Duet — is institutional and runs in parallel with, and independently of, both the Letby convictions themselves and the still-active CCRC review. The development underlines the divergence between the conviction-safety question (CCRC pathway) and the management-failings question (Operation Duet / Thirlwall) that has structured the post-2025 phase of the case.
Wrongful-conviction comparables — Allitt, Clark, Cannings, de Berk, Anthony
Five UK and Dutch wrongful-conviction (or contested-conviction) cases share structural features with the Letby case: a vulnerable-victim setting, a single-suspect framing, statistical evidence used as proof, and an expert-witness monoculture. Our pattern analysis sets out what each case's overturning required and which of those mechanisms are presently in motion in the Letby pathway.
Q1 2026 — January–March 2026
Commons debate — conduct of Cheshire Police in the Letby investigation
The House of Commons debates the conduct of Cheshire Constabulary's Letby investigation. Sir David Davis MP says the force made 'egregious' failures; Cheshire Constabulary rejects the criticism the following day. Parliamentary engagement to date also includes Davis's September 2024 trial-transparency point of order and his January 2025 adjournment debate 'Trial of Lucy Letby'.
CCRC head of investigations steps down from the Letby review
Shaun Edwards, the CCRC's head of investigations, will play no further part in the Letby review after it emerged he had publicly praised the Cheshire Police detective who led Operation Hummingbird. The CCRC said the step was taken 'in the interests of transparency'.
Sources & deeper reading
Post-trial scientific consensus — letters, statements, position papers
Since the February 2025 Panel report, the post-trial scientific record has continued to grow: NEJM and Lancet correspondence, neonatal-society position statements, independent expert re-analysis, and statistical-methodology critiques. Our aggregation tracks every significant published contribution and where each sits in the consensus picture.
Sources & deeper reading
Prosecution insulin expert was under formal investigation during the trial
The Guardian reveals that Prof. Peter Hindmarsh, the prosecution's key insulin expert on Babies F and L, was under a formal employer-led investigation (UCLH, with Great Ormond Street involvement) into serious concerns including allegations he harmed patients — and that he did not disclose this to Cheshire Police or the CPS before first giving evidence in November 2022.
CCRC review confirmed underway — Vera Baird statement
CCRC chair Dame Vera Baird KC publicly confirms the Letby application is under active review, with material received throughout 2025. She emphasises the Commission 'does not make decisions on the basis of external pressure'. Our explainer sets out the section-13-Criminal-Appeal-Act-1995 referral pathway, the Donna Anthony precedent, and what evidence weights at the referral threshold.
Netflix releases 'The Investigation of Lucy Letby'
A 90-minute Netflix documentary launches the conviction-safety debate to roughly 325 million subscribers worldwide. Following the Horizon-template precedent — where mass public re-engagement preceded the Post Office Court of Appeal referrals — observers note the cultural-event trigger that historically precedes referral activity is now in place.
Sources & deeper reading
CPS declines 11 further charges relating to 9 additional babies
The Crown Prosecution Service announces it will not proceed with eleven further charges relating to nine additional babies, citing 'the evidential test was not met.' The same investigative methodology that produced the original convictions did not, when applied to additional candidate cases, clear the threshold for prosecution.
Sources & deeper reading
Q4 2025 — October–December 2025
Further defence submissions filed with the CCRC
The CCRC's published chronology records further written submissions received from the defence team on 8 October 2025, on matters separate from those previously notified — one of nine filings recorded between February 2025 and January 2026 on the Commission's public timeline of the application.
Sources & deeper reading
Q3 2025 — July–September 2025
Three former Trust executives arrested — gross negligence manslaughter inquiry
Cheshire Police arrest three former Countess of Chester Hospital executives on suspicion of gross negligence manslaughter. The investigation is institutional, focused on senior-leadership conduct in 2015–2016, and proceeds independently of the Letby convictions. Observers note the institutional-failings frame here parallels the management-failure findings expected in the Thirlwall report.
Sources & deeper reading
Q2 2025 — April–June 2025
Joint Expert Witness Insulin Report on Babies F and L
A joint expert report on the insulin evidence for Babies F and L is published, setting out in technical detail why the Roche Cobas immunoassay results — used at trial as forensic proof of exogenous insulin — cannot bear that weight without confirmatory mass spectrometry that was never performed. The report identifies sample-handling, assay-interference and physiological-implausibility problems that, in combination, place the insulin counts below the criminal-evidential threshold.
Sources & deeper reading
Q1 2025 — January–March 2025
Shoo Lee International Expert Panel — full case-by-case review
Fourteen international neonatologists, convened by Dr Shoo Lee (Professor Emeritus, Toronto; lead author of the 1989 Archives of Disease in Childhood air-embolism paper relied on by the prosecution), publish a case-by-case review of every count on the indictment. The Panel finds 'no medical evidence of murder' in any indicted case and identifies natural-cause and resuscitation-associated mechanisms for every deterioration. This remains the single most consequential post-conviction evidential development.
Sources & deeper reading