Kingston Hospital has said it will not release details of an internal report into the death of four-year-old Freya Wells, dubbed “highly avoidable” at an inquest.

The Surrey Comet requested a copy of the serious incident investigation report into Freya’s death in November 2012 – attributed to “flagrant and extreme” failures by staff – through the Freedom of Information Act.

The hospital said: “Whilst there is a great deal of public interest currently in this case and release of the information may facilitate debate, openness and transparency, it would not be in the public interest for the contents of the report to prejudice external inquiries or legal cases, nor to breach the confidentiality of the patient nor her family.”

The hospital claimed the report was exempt from disclosure because of anonymous testimony from staff members it said could still be identified, and because it included medical information about Freya.

However, it admitted “a great deal of information” came out in January’s inquest.

Medical director Jane Wilson said earlier this year: “We carried out a full investigation following Freya’s death and made a number of changes within paediatrics to ensure that concerns about a child’s condition are always escalated appropriately.”