Labour Leader Ed Miliband urged that Lord Justice Leveson's proposals for future regulation of the press must be swiftly implemented - so long as they are "reasonable and proportionate".
Mr Miliband warned that if the Government rejected the Leveson Report, victims of intrusion from the media would see it as a "breach of the promise" made in the wake of the phone hacking scandal.
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Penalties of £100 or a court fine of up to £1,000 can now be handed to anyone caught lighting up in a private vehicle with someone under 18.