My son is 7 (8 Next month) and in yr 3. For the last 9 months or so I have left him in the school playground about 10/15 minutes before the whistle goes. I ALWAYS leave him either when another girl in his class turns up (alone) or when I think enough parents (I don't know them) are in the playground. I always take him into the playground and don't turf him out at the gate - although we are in London we are in a nice leafy suburb.
So AIBU??