I always hated them. They were just another thing to remember and lose. Did they ever keep any children safe? I doubt it. If your adults couldn't keep tabs on less than six children without them being looking like Belisha beacons, then perhaps they were going to lose the children anyway. We live in a risk averse culture. I once worked with a Year 1 class that weren't allowed to visit the park as part of a school trip because it was deemed too dangerous by the head, although many of them walked through it to get to school in the first place. Safety Culture was rarely about the safety of children, but rather about the cowardice of SLTs and the willingness of some local authorities to reach out-of-court settlements with vexatious claims by some parents.