David Cameron will unveil new plans today to block children from accessing pornography on wireless internet available in public places.
The Prime Minister is to announce a Government-backed code-of-conduct which will mean pornography is blocked in any public place where children are likely to be present.
Mr Cameron insists that the Government has a responsibility to provide 'good clean Wi-fi' in areas such as railway stations and cafes.
Campaigners argue children are increasingly likely to try and access pornography via internet in public places as parents are offered more and more sophisticated systems to monitor and limited their access in the home
He said: 'We are promoting good clean Wi-fi in local cafes and elsewhere to make sure that people have confidence in public Wi-fi systems so that they not going to see things they shouldn't.'
His intervention comes after a long running campaign by the Daily Mail to do more to protect young people from the dangers of internet porn.
The campaign has called for an automatic block on online porn with over 18s able to access adult sites by 'opting in' following a strict age check.
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The new deal has been the subject of talks between internet service providers and government officials for months.
It is not yet clear whether the restrictions will be enforced directly by the service providers themselves or whether it will be the individual responsibility of cafes and other public places and this could prove the first stumbling block.
Last year it was revealed that coffee giant Starbucks had failed to stop youngsters accessing explicit sites from their shops.
In January the firm implemented protections 'to restrict access to sites which are not deemed appropriate to view in a busy public environment'.
Prime Minister David Cameron is to announce a Government-backed code-of-conduct which will mean pornography is blocked in any public place where children are likely to be present
The Daily Mail's Block Online Porn campaign is calling for more to be done to protect young people
Starbucks' biggest rival, Costa Coffee were keen to point out that they have moved to block such material and McDonalds also applies a filter.
But there is also concern that it will not be so easy to define many areas definitively as either child friendly or adult.
Industry sources have, for example, suggested that the decision on which category hotels fall into could be contentious.
Today's move has long been called for by children's charities fearful of what children are able to access on public Wi-fi sites.
Last month the Children's Charities Coalition on Internet Safety wrote to BT, the country's biggest internet provider, demanding urgent action.
They argue that children are increasingly likely to try and access pornography via internet in public places as parents are offered more and more sophisticated systems to monitor and limited their access in the home.
But last night the coalition, which includes the NSPCC and The Children's Society, welcomed the coaltion's intervention.
John Carr, the organisation's secretary said he had no problem with 'adult' locations such as casinos offering access to pornography but that it was a 'modern reality' and a solution had to be found.
Speaking to the Telegraph he said: 'We welcome any deal which is long overdue.
'Public access to the internet is modern reality and we have to find a way of dealing with this growing problem.'