A woman has described how her 17-year-old black British son was found at an immigration detention centre after going missing while being treated for psychosis. The boy – who is non-verbal – disappeared from a hospital in Kent, where he had been sectioned under the Mental Health Act, on 7 April. Two days later, he was arrested by British Transport Police (BTP) at Euston on suspicion of fare evasion, before being detained by Immigration...