Lucy Letby Inquiry Finds 'Complete Failure' as Three Babies Might Have Survived Had Hospital Acted Sooner

The Thirlwall Inquiry has found a 'complete failure' to protect babies from Lucy Letby, concluding in its 15 September 2026 report that earlier action by hospital leaders might have saved three babies and protected seven others from harm.

Lady Justice Kathryn Thirlwall blamed serious failures in safeguarding and hospital leadership, saying staff needed only suspicion of deliberate harm to begin safeguarding action.

Inquiry Says Earlier Action Could Have Saved Lives

The inquiry identified several chances to intervene before hospital leaders removed Letby from the neonatal unit in July 2016. One came in August 2015, after tests showed that Baby F had received insulin from an external source.

Thirlwall said doctors should have raised the result with the medical director. Hospital leaders should then have contacted police, but neither happened.

Concern grew after Baby I died in October 2015. Consultants began discussing Letby's link to unexplained collapses and deaths. Yet staff still did not start safeguarding procedures.

Another warning came after Baby L suffered insulin poisoning in April 2016. Thirlwall said staff should again have alerted senior management and police.

Senior staff met on 11 May 2016 to discuss the rising mortality rate and Letby's presence during incidents. They chose a 'monitor and alert' approach instead of removing her from the unit.

Baby O and Baby P died six weeks later on successive days. The inquiry said managers should have removed Letby after the May meeting while they investigated the concerns.

Thirlwall found that earlier intervention could have prevented deaths and attacks. She also said investigators cannot know exactly how many babies might have escaped harm.

Hospital Kept Parents in the Dark

The inquiry criticised hospital leaders for withholding concerns about deliberate harm from families. Some parents did not learn about those concerns until 2018.

Hospital leaders also commissioned reviews that did not examine possible deliberate harm. Senior nurses rejected consultants' concerns, while managers delayed contacting Cheshire Constabulary.

Letby later filed a grievance after hospital leaders moved her from clinical duties. The process then shifted scrutiny towards some doctors who had raised concerns.

Hospital managers told three consultants to apologise to Letby. They also considered returning her to the neonatal unit before dropping the plan.

Letby is serving 15 whole-life orders for murdering seven babies and attempting to murder seven others. She maintains her innocence.

The Criminal Cases Review Commission is reviewing an application concerning her convictions. That process remains separate from the Thirlwall Inquiry.

The inquiry did not reassess Letby's convictions. It examined how hospital staff treated families and handled safeguarding concerns.

Government Backs Urgent NHS Changes

The inquiry issued 17 recommendations. One calls for livestreaming cameras on neonatal cots and incubators so parents can watch their babies remotely.

Another calls for tighter controls on insulin storage. The report also wants hospital boards to monitor child deaths and escalate worrying patterns.

Health and Social Care Secretary Yvette Cooper apologised to families on behalf of the government and health service. She said officials would urgently develop plans for neonatal 'cot cams' and review safeguarding rules.

The government also backed stronger insulin controls. It plans to introduce a barring system for National Health Service managers and issue a fuller response to the report.

Cheshire Constabulary said it would consider the findings alongside Operation Duet. The investigation examines possible corporate manslaughter linked to hospital leadership decisions.

Officers are also investigating possible gross negligence manslaughter. Police arrested three former senior leaders in June 2025, and all three remain on bail.