Any advice leading to a decision not to press charges in the cash-for-honours police investigation will be made public, the attorney general has pledged.
People who buy and sell personal information could be jailed for up to two years, under government proposals aimed at clamping down on the trade.
Downing Street has rejected claims by one of the nine men arrested by counter-terrorism police in Birmingham last week that Britain is becoming a "police state for Muslims".
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