Mr Cameron faced repeated questions on the issue in the Commons on Wednesday and told MPs he had had no "inappropriate conversations".

BBC: Phone hacking: Scotland Yard boosts probe team

Club Penguin currently uses filters to prevent inappropriate conversations.

BBC: Lane Merrifield, founder of Club Penguin

And they assert, as well, that when the president admitted he had occasional telephone conversations that included inappropriate discussions that was false because they had actually had 17 such phone conversations.

CNN: Transcript: White House Counsel Ruff's opening statement

Alan Locke told the hearing that he believed the conversations between Mr Routledge and pupils had been "totally inappropriate".

BBC: Howell's girls school in Denbigh