Nonita had a voice, but nobody heard it.

Aged just 18 and in care, Nonita was hit and killed b y a moving train – despite repeatedly warning the professionals responsible for her that she planned to take her own life.

Shocked by Nonita's untimely death, Katharine Bryson - a volunteer who had worked with her - became determined to find out who knew what, and when.

What she uncovered horrified her – and it's a story the state never wanted to be told.

Niall is joined by Sky's people and politics correspondent Nick Martin.

Warning: this podcast contains descriptions of suicide and self-harm.

If you have been affected by any of the issues raised in this story, help and support is available. You can call Samaritans free on 116 123 anytime day or night. You can also email [email protected] or visit www.samaritans.org to find support online.

For more on this story, you can watch the full documentary on the Sky News website.

Producers: Tom Gillespie & Araminta Parker

Editor: Mike Bovill