Three men have each been jailed for a minimum of 37 years for murdering nursery school teacher Sabrina Moss, who was gunned down in the street while out celebrating her 24th birthday.
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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.