A key medical witness in the Lucy Letby trial has said he has changed his mind about how one of the babies was killed.

James Phillips, a former government science adviser for Boris Johnson, who has criticised the trial, said: “Pivotal evidence for one of the Lucy Letby murder convictions is deeply flawed, as she appears to have never met the baby at the time it was obtained.

Doctors were growing increasingly concerned about the link between Letby and dying babies at the hospital, but thought the problem would be dealt with by NHS bosses

A doctor has told the public inquiry into Lucy Letby’s crimes that he felt "ashamed" for "failing to protect" babies from the former nurse. Consultant paediatrician Dr John Gibbs, now retired, was working at the Countess of Chester Hospital when Letby began attacking vulnerable babies on the neonatal unit in June 2015.

Dr John Gibbs told the public inquiry into the serial killer's (pictured) crimes that he and his colleagues were guilty of 'dithering' and should have called in police sooner.