Accessing 'core data' necessary for policing effectively

Mick Creedon, who runs Derbyshire Police, said controversial proposals debated this week were about ensuring existing powers used "all the time" by police investigations were preserved as technology improved.

He told the BBC Radio 4 Today programme: "The point is the world of policing, investigating serious crime and terrorism, and actually protecting vulnerable people, depends to a certain extent on accessing some things like core data. The safeguards in place are two fold."

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Lib Dems vow to halt 'snooping'

Liberals Democrats have vowed to kills government plans to allow all calls, emails, texts and website visits to be monitored. David Cameron has insisted the scheme should plud "significant gaps" in UK security.