Gareth Williams: Ex-chief defends online centre's investigation
14 April 2014 Last updated at 20:25 BST
The ex-head of the Child Exploitation and Online Protection Centre (CEOP) has defended his former colleagues over claims that teacher Gareth Williams could have been caught earlier.
Jim Gamble said there were too few people doing far too much work at CEOP, adding that the pressure there was "horrendous".
Mr Gamble conceded that someone had made a mistake when carrying out an assessment of information from Canada, where police had filtered through credit card records from people who had bought sexually explicit images of children from a website run by the man they had been investigating.
Ceop said it is carrying an independent review of how quickly they acted on the intelligence, and admit that all steps which should have been completed at the time, did not take place.
Williams, 47, from Cardiff, admitted 31 charges including nine of voyeurism, 20 of making indecent photos and two of possessing indecent photos at Newport Crown Court.
He admitted possessing 679 indecent moving images of children of a voyeuristic nature.
Speaking to BBC Wales Today presenter Jamie Owen he accepted that swifter action may have seen Williams caught earlier.