@Hannah1048 I have no idea I am afraid. I suspect there are no requirements (other than a CO alarm) and it is up to peoples common sense to not allow their children to burn themselves on it. Perhaps ask your insurer or local fire brigade?
I have a log fire and don't use a fire guard @Hannah1048 . If parents want to use it while children are at the listing they need to make sure their children don't go near it.