The Office of Fair Trading has launched an investigation into games on phones and tablets that are free to download, but could end up costing parents hundreds - even thousands - of pounds.
It follows concerns that children could be tricked into spending money on upgrades without realising the cost.
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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.