Thanks for the new thread
If “stay alert” means “use common sense” I’m afraid I’m one of the people who didn’t get it.
But when Jenny Wotsit of the science “experts” says “children can’t have pencils in case they share them” I don’t know what common sense is either.
I’d say if I feel unwell, I need to stay at home.
But I can’t agree that common sense is “you have to meet your parents in public because if you walk through the house to reach the garden, you put them at risk”.