The Royal London Hospital is trialling a new way of caring for homeless patients, looking at their social and psychological needs as well as their medical ones.
The London Pathway approach will see all the patients' needs identified in the hospital before discharge, so that help can be arranged in time for their departure.
A nurse will act as the liaison between the hospital and outside organisations - such as a local housing authority or a patient's hostel manager - in the hope that this will reduce the chance of patients being re-admitted with the same health problems.
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Fagan-Gayle, a singer song writer who has also appeared on Celebrity Big Brother.
Police were called at around 2.30am on Wednesday and found sledge hammers and pick-axes.
The boy was attacked on a bus in south London. Police say he was stabbed in the stomach.