[West Ender]

My daughter is a Guider (Brown Owl for a local pack). Anyone who helps in any capacity, in Scouting/Guiding, has to be CRB checked first. She, herself, had to supply a copy of her own CRB certificate to my granddaughter's school when she volunteered to go on a school trip as a helper. As you rightly point out, though, the person who hasn't been caught has no record so someone could, in theory, have been getting away with abuse for decades - and still be regarded as "trustworthy".