The chain of escalation — 2015 to 2017
Prosecution claim
The institutional narrative accepted at trial was that the Trust's 2015–2017 handling of consultants' concerns followed a broadly reasonable escalation chain culminating in the May 2017 police referral. The Trust, on this reading, took the concerns seriously, commissioned an external review, and eventually brought in police when circumstances required it.
Counter-evidence
The Thirlwall Inquiry record of the 2015–2017 period documents an escalation chain that failed at every institutional checkpoint. Consultants raised concerns from July 2015 onwards. Internal reviews in February 2016 identified Letby as a common factor but produced no action. The June 2016 removal of Letby from clinical duties was not followed by police contact. The September 2016 joint consultants' letter demanding police involvement was met with an HR grievance process against the consultants rather than a police referral. The November 2016 RCPCH review was scoped to service-level questions rather than individual deaths. Police were not contacted until May 2017 — eight months after the consultants' letter and nearly two years after the first indicted death. Every checkpoint in the chain had an opportunity to escalate to police; every checkpoint did not.
A chain of escalation that breaks at every link is not a chain of escalation that worked slowly. It is a chain of escalation that was deliberately managed not to escalate.
What the jury heard
The jury was presented with the fact of police referral in May 2017 without being walked through the eight-month sequence between the September 2016 letter and the eventual referral. The detail of why executives resisted police contact was not systematically developed.
What the Panel says
The Panel's remit is medical not institutional, but its finding that every indicted case is explicable without deliberate harm, combined with the documented escalation failure in the institutional record, supports the reading that the eventual criminal case proceeded on a distorted institutional foundation.
What independent experts add
- July 2015 — first consultant concerns raised (Dr Brearey).
- February 2016 — internal thematic review identifies Letby as common factor.
- June 2016 — Letby removed from clinical duties after further deaths; no police contact.
- September 2016 — seven consultants write joint letter demanding police involvement.
- Autumn 2016 to spring 2017 — HR grievance process runs against the consultants.
- November 2016 — RCPCH Invited Service Review commissioned; does not examine individual deaths.
- May 2017 — Cheshire Police eventually contacted.
- July 2025 — three former Trust executives arrested on suspicion of gross negligence manslaughter in connection with the deaths.
- The eight-month delay allowed contemporaneous evidence of unit conditions to dissipate.
- Helene Donnelly OBE described the pattern at the Thirlwall Inquiry as a textbook example of institutional suppression of a patient-safety escalation.