The case against Lucy Letby began when Countess paediatricians Drs Brearey and Jayaram pointed the finger at her in July 2015. It is not clear, and may never be, whether they genuinely believed she was harming babies or whether, as Letby's defence argued at trial, they were covering up their and colleagues' clinical negligence.

Regardless, associating Letby's presence with deaths was where it all started, and this was all the paediatricians ever had. Indeed, if one discounts the medical and "confession" evidence, which has now been robustly challenged, it is all there ever was to the prosecution case. In this video I challenge the assertion by the pro-guilt camp that Letby's presence at many of the deaths is strong evidence of her guilt. And I conclude that this last pillar of the prosecution case has also now collapsed.

I do this by making essential adjustments to the prosecution's base case, by excluding deaths that should not be included, by taking account of the fact that Letby was called for duty when the intensive care nursery was busy and thus when mortality risk was higher (and indeed when deaths occurred) and, most importantly, by taking account of the strong possibility that Letby was simply the unluckiest nurse.