In a presentation at August's DefCon hacker conference, security researcher Michael Brooks showed how those audio CAPTCHAs can be disassembled by computers.

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CNN's Victor Blackwell, Carol Cratty, Vivian Kuo, Rich Phillips, Larry Shaughnessy, Barbara Starr, Michael Pearson, Steve Almasy and HLN law enforcement analyst Mike Brooks also contributed to this report.

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Conservative deputy chairman Michael Fallon dismissed what he called petty point-scoring by saying former NI executive Rebekah Brooks and Mr Cameron were both clear no inappropriate discussions had taken place.

BBC: Phone hacking: Scotland Yard boosts probe team