England, a small island country, blanketed with security cameras, saturated with mobile phones. Yet somehow, British parents still lose their kids in public places all the time.
Child Safe Zones is a centralized, nationwide network of venues (over 7,000 so far) which have harmonized their lost child response protocols to enable rapid response by parents and local security when a kid goes missing.
In a CSZ, parents call the Child Safe number and are routed immediately to the venue's security. Child Safe also provides contact info/ID tags and bracelets for kids.
The whole thing sounds like a combination of 911, Amber Alerts, and those "If found, return to Tiffany's" keychain fobs. All for £10 per family per year.