Why her case matters for the Letby review
The Angela Cannings case sits alongside the Sally Clark case and the Donna Anthony case as the three major post-Meadow miscarriages of justice. In each case, a mother was wrongly convicted of infanticide on:
- Statistical evidence (misapplication of the “rare therefore suspicious” pattern).
- Paediatric-pathology evidence (retrospective reinterpretation of previously-explained deaths).
- Sir Roy Meadow’s expert testimony.
In each case, the exoneration on appeal drove the Royal Statistical Society to publish guidance that directly applies to the Letby shift-rota chart. Understanding the three cases together is understanding the framework Prof. Richard Gill, Prof. Peter Green, the Bar Council signatories and the October 2025 CCRC application materials are applying.
The facts of her case
- Mother from Salisbury. Her first son died at seven weeks; a second son died at 18 weeks; a third son died at 19 weeks.
- Convicted in April 2002 of the murder of the second and third sons.
- Central expert evidence: Sir Roy Meadow, whose “multiple cot deaths in one family is suspicious” framing had already been discredited (but not yet withdrawn from practice) by the time her appeal was heard.
- Genetic testing subsequently identified a familial pattern consistent with a genetic predisposition to sudden infant death.
- Acquitted on appeal in December 2003. Her acquittal triggered a Court of Appeal warning against relying on paediatric expert evidence where other experts reasonably disagree.
The Court of Appeal’s principle
The Cannings Court of Appeal judgment articulated a specific principle of direct relevance to the Letby case: where reputable medical experts disagree about the cause of a death, and the medical evidence is the sole or principal basis for conviction, the conviction is unsafe.
The post-Panel expert record in the Letby case is a record of reputable medical experts disagreeing with the Crown’s causation opinion on every indicted case. The Cannings principle therefore applies directly.
Why this biography is on the site
The Cannings principle is a specific Court of Appeal formulation that the CCRC review of the Letby case has available to it. Readers who know the Sally Clark case but not the Cannings case are missing half of the statistical-evidence miscarriage framework. This biography supplies the reference.
The Cannings principle and its application to the Letby case
The Cannings principle, articulated by the Court of Appeal in R v Cannings (2004), states that where serious disagreement exists between reputable experts on the medical causation of death, prosecutions on that basis should not proceed. The principle was the direct legal product of Mrs Cannings’s own quashed conviction and was articulated specifically to prevent the recurrence of medical-causation prosecutions where expert disagreement was sufficient to create reasonable doubt.
The Cannings principle is one of the load-bearing legal frameworks the Letby CCRC application engages. The post-conviction Shoo Lee International Expert Panel finding that no indicted case meets the diagnostic criteria for deliberate harm establishes serious disagreement with the Crown’s medical experts (Dr Dewi Evans, Dr Sandie Bohin, Dr Andreas Marnerides, Prof. Owen Arthurs, Prof. Peter Hindmarsh). Whether the Cannings principle retrospectively applies to disturb the Letby conviction is one of the central questions the CCRC review engages.
The post-Meadow trio and the Royal Statistical Society reform programme
Mrs Cannings’s case is the second of the post-Meadow trio of UK mother-killer convictions overturned in 2003-2005 (Sally Clark, December 2003; Angela Cannings, January 2003; Donna Anthony, April 2005). The trio collectively prompted the Royal Statistical Society’s framework on statistical evidence in criminal trials, the Court of Appeal’s Cannings principle on serious-expert-disagreement cases, and the broader UK criminal-justice reform on medical-causation prosecutions.
Why this biography is on the site
Angela Cannings is not connected to the Letby case except by parallel structure. We include her biography because the Cannings principle her case produced is load-bearing in the Letby CCRC application’s legal-framework submissions. Readers unfamiliar with the Cannings case cannot fully weigh the legal-framework dimension of the post-conviction critique. This biography supplies the procedural reference. Mrs Cannings died in 2024.