Welcome to Britain's Bronx: Towers stuffed with addicts and migrants, children selling crack, and poverty, prostitution and murders. As video of girl allegedly wielding an axe goes viral, GRAHAM GRANT visits her home - and finds squalid truth

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It is mid-afternoon in a high street in Scotland and a young man is openly snorting cocaine in a doorway. A few yards away, schoolchildren on bicycles are selling drugs.