At sports day before the summer holidays, I witnessed a mum and dad of a child in my Dds class drop Greggs wrappers on the school playing field. I was going to say something at the time but they are quite intimidating and then they walked off laughing, leaving their wrappers/coffee cups there.
today, I have seen them leaning out their car and leaving another coffee cup on the pavement next to the school and the other day I saw them drop something else at pickup in the playground. Would you say something to them or inform school?