Yes, I do tell my 15 month old. Problem is he’s 15 months old so can go rogueI used my mouth and told him no (many many times), he doesn't touch them now.
It isn’t regarding the holes - it’s just the switchesModern UK sockets are very safe so unless your toddler can work out how to jam something into the earth prong hole to open the flaps you should be ok?
I know all kids are different but we never did anything with ours apart from telling my daughter not to touch them.
Yeah, we saw that with our first.I think that's exactly the risk. They're generally crap plastic that breaks off in the hole and it goes unnoticed or something or other.