There's no evidence in that newspaper report of him having any previous criminal record or warnings. Have you mis-understood what a CRB check provides?
He's now banned from working with children
, which should flag up on any future CRB check.
On future ones yes, but its not the fix all that some think it is as someone can have a clean CRB yet be abusing kids until such time as they are caught. And then of course you have the countless people where Capita employees have incorrectly entered data info which prevents innocent people getting a job.