Private security giants G4S and Serco are to be stripped of all responsibilities for electronically tagging criminals following an overcharging scandal.
Electronic monitoring contracts will be handed over to rival firm Capita on an interim basis at the end of the financial year, Justice Secretary Chris Grayling said.
Capita is in the running to take on the contracts permanently.
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Youngsters are still consuming too much unnecessary sugar and caffeine, according to the study.
Home Office data offers an incomplete picture of the perpetrators and victims, the National Audit Office (NAO) have said.
The report concludes that nine million adults suffer from constant loneliness, which is as harmful to health as obesity or smoking.