A High Court has ruled that boys at a young offenders institute in Bristol were unlawfully punished.
Seven boys at the privately owned Ashfield prison made the claim after they were punished following a protest against living conditions in their wing.
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Jeremy Corbyn's visit has been one of the big talking points of another busy day at Glastonbury.
The Labour leader said socialist politics would not be put "back in a box" as he appeared on stage at the festival.
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