Conservative former cabinet minister says nurse convicted of murdering seven babies has suffered a miscarriage of justice

The police force that conducted the investigation into the nurse Lucy Letby made “egregious” failures and did not follow official guidance or best professional practice, David Davis has said in parliament.

Speaking in the final parliamentary debate before the Easter recess, the Conservative former cabinet minister made a series of criticisms of Cheshire police and said Letby has suffered a miscarriage of justice. Davis said Cheshire police failed to appoint appropriate medical and statistics experts, and pursue all possible lines of inquiry into why babies died and collapsed on the “failing” neonatal unit of the Countess of Chester hospital in 2015-16.

The backbench opposition MP said his latest intervention in the case is based on reviews by two former police detectives: former Det Supt Stuart Clifton, who led the investigation into Beverley Allitt, a nurse who was convicted in 1993 of murdering four children, attempting to murder another three and causing grievous bodily harm with intent to a further six; and Steve Watts, a former assistant chief constable who wrote national police guidelines on the investigation of deaths in healthcare settings.