Alex Salmond has pledged that one of the first actions of an independent Scottish government would be to "scrap the Bedroom Tax".
He compared the opposition to the so-called Bedroom Tax to that against the Poll Tax, and said it was a "symbol of why independence is necessary".
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."