Labour's Shadow Local Government Secretary, Hilary Benn, has said that council tax changes which come into effect in April are not "fair".
He also said councils have been put in an "impossible position" by the government because they have passed on the responsibility for council tax support "but they haven't passed on the bucks".
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Boris Johnson is expected to attack George Osborne's plan to cut tax credits when he addresses the Conservative Party conference on Tuesday.
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Councils have welcomed the prospect of greater autonomy on business rates, but this is not as generous an act as it first appears.