potty stop

british ‘A’ roads often have signs pointing to laybys with the letter ‘P’ by them. I always thought that meant Parking. until we had children.
now i know it means ‘potty’.
jane asked me to get out the car and help so i did. when we finally got back in the car and drove off she said to me very sweetly “you know when i said help, i didn’t mean ‘take a photo’, i actually meant ‘please help me’ ”
i am SO rubbish at understanding things like that.