The Government is failing to resolve the issue of access to child abuse images on the internet, major children's charities said today.
More than 700,000 UK households still have easy access to illegal child abuse image sites, they said.
The Children's Charities' Coalition on Internet Safety, which includes the NSPCC, Barnardo's and The Children's Society, expressed "regret and serious concern" at the "seriously damaging" situation for children.
Zoe Hilton, policy adviser for the NSPCC, and speaking on behalf of the Coalition, said: "Over 700,000 households in the UK can still get uninterrupted and easy access to illegal child abuse image sites.
"Allowing this loophole helps to feed the appalling trade in images which feature real children being seriously sexually assaulted.
"We now need decisive action from the Government to ensure the Internet Service Providers that are still refusing to block this foul material are forced to fall into line.
"Self-regulation on this issue is obviously failing - and in a seriously damaging way for children."
In 2006, the Home Office confirmed it was Government policy to ensure all UK ISPs should deploy a blocking mechanism for child abuse images based on the list of known illegal websites maintained by the Internet Watch Foundation, and that this should be done by the end of 2007, Ms Hilton said.
She added: "Some people commented at the time that allowing ISPs 18 months to bring themselves into line on something like this was excessively generous but at least it was a definite, time-limited commitment."
However, in June 2008, the Home Office indicated that the proportion of UK households covered had reached 95%, and another official response recently said it was still 95%, with the Government "looking at ways to progress the final 5%".
Ms Hilton said: "In other words, in getting on for three years of effort, the percentage has moved from 90% to 95%, and we still have no idea when the Government will finally conclude that the industry will not get us to the 100% which has been the basis of policy since May 2006."Reuse content