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NHS psychologists are working in homeless hostels and mental health specialists are joining outreach workers on the streets in pioneering projects in London to try to help the rising numbers of rough sleepers struggling with their mental health.
Last year, 3724 people with mental health problems were sleeping on the capital's streets, an increase of 52% in the last five years.
The latest official figures show 50% have an identified mental health issue, although psychologists believe the true figure to be much higher.
Dr Emma Williamson, a clinical psychologist for South London and Maudsley NHS foundation trust, said almost every client struggles with their mental health.
She's in charge of a pioneering team whose office is in a homeless hostel in Vauxhall run by the London charity Thames Reach. They are the only team of NHS psychologists in the country to be based inside a hostel.
Justin Strevens has lived there for almost two years. In his 44 years, this is the longest he's ever stayed in one place.
Before he came here, he'd been sleeping rough for a decade trying to deal with depression and traumatic grief as well as alcohol addiction.
Those sleeping rough can be harder to find and even harder to help. Thames Reach outreach workers now often work in partnership with a mental health social worker or consultant psychiatrist.
Outreach worker Ben Sebok works in North London, patrolling wasteland to visit and revisit people with mental health issues living in tents and makeshift shelters.