Waltham Forest

Even so, the fastest selling, with an agreed sale taking an average of 19 days, had a north-south mix, with Manchester and the London borough of Waltham Forest hitting that mark.

Now the BBC has learned that the local authority where the school is based, Waltham Forest, was warned that calming rooms were being over-used at Whitefield the year before they were shut down following an Ofsted inspection - but it failed to act.

Waltham Forest did not comment when approached by the BBC.

In response to our latest findings, the government said a consultation is under way about use of force and restrictive interventions - and it is awaiting the findings of a Waltham Forest investigation.

The inquest also heard from Kay Mockford, Emily's former social worker at Waltham Forest Council, which was caring for the teenager.