A TEENAGER who went missing with three others from a secure mental health unit in Beckenham has been locked up.

Police had been appealing for help to find Danhi Smith, aged 18, who escaped from the adolescent unit at Bethlem Hospital in Monks Orchard Road on February 26.

He turned up at Bethlem over the weekend and was arrested on suspicion of being unlawfully at large.

Smith has been sent to a young offenders institute where he is on remand awaiting trial for an alleged robbery.

The other three teenagers were all found within a few days of their escapes and returned to Bethlem.