Web searches for child abuse images will be blocked for the first time by Google and Microsoft after mounting pressure. New software is to be introduced that will automatically block 100,000 "unambiguous" search terms which lead to illegal content.
Child protection expert Mark Williams-Thomas said the Prime Minister should be clear that today's announcement is more about stopping children and young people accessing child abuse images "rather than tackling offenders accessing this material".
However, Mr Williams-Thomas acknowledged on Twitter that it was "a good step forward":
These are dramatic new steps which will make the internet safer and better for children, a leading Internet safety expert writes.
The search engines have stepped up to the plate - their reforms will help remove video child abuse content more quickly and comprehensively.
Former chief of CEOP Jim Gamble said the government must ask whether they are doing enough in the internet safety debate.