OST is a charity striving for a justice system that meets the needs of women and their children, recognises the importance of trauma and promotes healing and hope for the future.

The charity promotes the relief and rehabilitation of prisoners in the UK prison estate, of ex-offenders and of people at risk of offending. OST delivers gender-responsive and trauma informed trainings within the criminal justice system, and provides community-based centres offering accommodation, specialist services and opportunities to engage in work activities, education and training to women (and their children) who are in the criminal justice system or at risk of offending or re-offending (the Hope Street project).