Court of Appeal quashes Angela Cannings's conviction — the Cannings principle established

The Court of Appeal (Criminal Division) quashes Angela Cannings's conviction for the murder of her two infant sons. The judgment articulates the Cannings principle: where a conviction depends on medical expert evidence and reputable medical experts disagree, the conviction is unsafe. The principle applies directly to the Letby case: the post-Panel expert record is a record of reputable medical experts disagreeing with the Crown's causation experts on every indicted case.